NetBSD Multimedia Resources List
Links on this page refer to multimedia resources (podcast, vodcast,
audio recordings, video recordings, photos) related to NetBSD or
of interest for NetBSD users.
This list is available as chronological
overview, as a tag cloud and
via the sources.
This list is also available as RSS feed
If you know any resources not listed here, or notice any dead links,
please send details to
Edwin Groothuis so that
it can be included or updated.
EuroBSDCon
Andre Opperman - The papers I write for EuroBSDCon 05
Source: EuroBSDCon
Added: 14 January 2007
Tags: eurobsdcon, eurobsdcon2005, paper, freebsd, networking, andre opperman
Optimizing the FreeBSD IP and TCP Stack (1 Mb), New Networking Features in FreeBSD 6 (92 Kb)
The papers I write for EuroBSDCon 05 on New Networking
Feature in FreeBSD 6.0 and Optimizing FreeBSD IP
and TCP in 7-CURRENT
EuroBSDCon 2006 pictures
Source: EuroBSDCon
Added: 14 November 2006
Tags: eurobsdcon, eurobsdcon2006, photos, christian laursen
EuroBSDCon 2006 pictures by Christian Laursen
EuroBSDCon 2006 pictures
Source: EuroBSDCon
Added: 14 November 2006
Tags: eurobsdcon, eurobsdcon2006, photos, erwin lansing
EuroBSDCon 2006 pictures by Erwin Lansing (erwin@)
EuroBSDCon 2007 Papers
Source: EuroBSDCon
Added: 05 October 2007
Tags: eurobsdcon, eurobsdcon2007, papers
Pawel Jakub - FreeBSD/ZFS - last word in operating/file systems (337 Kb), Stephen Borrill - Building products with NetBSD - thin-clients (407 Kb), John P Hartmann - CMS Pipelines Explained (118 Kb), Soren Straarup - An ARM from shoulder to hand (307 Kb), Brooks Davis - Building clusters with FreeBSD (2.2 Mb), Steven Murdoch - Hot or Not: Fingerprinting hosts through clock skew (6.1 Mb), Brooks Davis - Using FreeBSD to Promote Open Source Development Methods (989 Kb), Sam Leffler - Long Distance Wireless (for Emerging Regions) (19 Mb), Antti Kantee - ReFUSE: Userspace FUSE Reimplementation Using puffs (102 Kb), Yvan VanHullebus - NETASQ and BSD: a success story (2.4 Mb), Ryan Bickhart - Transparent TCP-to-SCTP Translation Shim Layer (692 Kb), Pierre Yves Ritschard - Load Balancing (23 Kb), John P Hartmann - Real Men's Pipes - When UNIX meets the mainframe mindset (382 Kb), Claudio Jeker - Routing on OpenBSD (1.3 Mb), Marc Balmer - Supporting Radio Clocks in OpenBSD (304 Kb), Peter Hansteen - Firewalling with OpenBSD's PF packet filter (531 Kb), Simon L Nielsen - The FreeBSD Security Officer function (251 Kb), Robert Watson - FreeBSD Advanced Security Features (152 Kb), Ryan Bickhart - Transparent TCP-to-SCTP Translation Shim Layer (491 Kb), Kirk Mckusick - A Brief History of the BSD Fast Filesystem (145 Kb), George Neville-Neil - Network Protocol Testing in FreeBSD and in General (251 Kb), Sam Smith - Fighting "Technical fires" (1.4 Mb), Marko Zec - Network stack virtualization for FreeBSD 7.0 (401 Kb), Isaac Levy - FreeBSD jail(8) Overview, the Secure Virtual Server (120 Mb)
EuroBSDCon 2007 Papers
EuroBSDCon 2007 Photos
Source: EuroBSDCon
Added: 26 September 2007
Tags: eurobsdcon, eurobsdcon2007, photos, flickr
Eystein.aarseth - Photos from EuroBSDCon in Copenhagen, Denmark, september 2007, Tom (Snow) - Foto's taken bij Tom and Robert of www.snow.nl, Peternmhansteen, Ed Kikkert - EuroBSDCon 2007 taken place in Copenhagen, Denmark 14-15 September 2007 at the Symbion Science Park, Rick van der Zwet
EuroBSDCon 2007 Photos by various people
EuroBSDCon 2007 Videos
Source: EuroBSDCon
Added: 10 October 2007
Tags: eurobsdcon, eurobsdcon2007, videos
Soren Straarup - An ARM from shoulder to hand (141 Mb), Pawel Jakub - FreeBSD/ZFS - last word in operating/file systems (203 Mb), Yvan VanHullebus - NETASQ and BSD: a success story (382 Mb), Claudio Jeker - Routing on OpenBSD (394 Mb), Brooks Davis - Using FreeBSD to Promote Open Source Development Methods (92 Mb), Gregers Petersen - Open Source - is it something new? (285 Mb), Antti Kantee - ReFUSE: Userspace FUSE Reimplementation Using puffs (197 Mb), Steven Murdoch - Hot or Not: Fingerprinting hosts through clock skew (235 Mb), Sam Smith - Fighting "Technical fires" (147 Mb), Kirk Mckusick - A Brief History of the BSD Fast Filesystem (251 Mb), George Neville-Neil - Network Protocol Testing in FreeBSD and in General (271 Kb), Robert Watson - FreeBSD Advanced Security Features (200 Mb), Sam Leffler - Long Distance Wireless (for Emerging Regions) (248 Mb), Simon L Nielsen - The FreeBSD Security Officer function (195 Kb), Stephen Borrill - Building products with NetBSD - thin-clients (364 Mb), Pierre Yves Ritschard - Load Balancing (219 Mb), Isaac Levy - FreeBSD jail(8) Overview, the Secure Virtual Server (350 Mb), Ryan Bickhart - Transparent TCP-to-SCTP Translation Shim Layer (376 Mb), John P Hartmann - Real Men's Pipes - When UNIX meets the mainframe mindset (315 Mb)
EuroBSDCon 2007 Papers
EuroBSDCon 2008 - Aggelos Economopoulos - An MP-capable network stack for DragonFlyBSD with minimal use of locks
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, dragonflybsd, mp, network stack, aggelos economopoulos
MP3 (1 byte, 42 minutes), OGG (1 byte, 42 minutes), PDF (1 byte, n pages)
Given the modern trend towards multi-core shared
memory multiprocessors, it is inconceivable for
production OS kernels not to be reentrant. The
typical approach for allowing multiple execution
contexts to simultaneously execute in kernel mode
has been to use fine-grained locking for synchronising
access to shared resources. While this technique
has been proven efficient, empirical evidence
suggests that the resulting locking rules tend to
be cumbersome even for the experienced kernel
programmer, leading to bugs that are hard to diagnose.
Moreover, scaling to more processors requires
extensive use of locks, which may impose unnecessary
locking overhead for small scale multiprocessor
systems. This talk will describe the typical approach
and then discuss the alternative approach taken in
the DragonFlyBSD network stack. We will give an
overview of the various protocol threads employed
for network I/O processing and the common-case code
paths for packet reception and transmission.
Additionally, we'll need to make a passing reference
to DragonFlyBSD's message passing model. This should
establish a baseline, allowing us to focus on the
recent work by the author to eliminate use of the
Big Giant Lock in the performance-critical paths
for the TCP and UDP protocols. The decision to
constrain this work on the two by far most widely-used
transport protocols was made in order to (a) limit
the amount of work necessary and (b) explore the
effectiveness of the approach on the cases that
matter at this point in time.
EuroBSDCon 2008 - Anttii Kantee - Converting kernel file systems to services
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, anttii kantee
MP3 (1 byte, 55 minutes), OGG (1 byte, 55 minutes), PDF (1 byte, n pages)
ABSD/UNIX operating system is traditionally split
into two pieces: the kernel and userspace. Historically
the reasons for this were clear: the UNIX kernel
was a simple entity. However, over time the kernel
has grown more and more complex. Currently, most
of the same functionality is available both in
userspace and the kernel, but under different names.
Examples include synchronization routines and
threading support. For instance, to lock a mutex
in the NetBSD kernel, the call is mutex_enter(),
while in userspace the routine which does exactly
the same thing is known as pthread_mutex_enter().
Taking another classic example, a BSD style OS has
malloc()/free() available both in userspace and the
kernel, but with different linkage (the kernel
malloc interface is currently being widely deprecated,
though). This imposes a completely arbitrary division
between the kernel and userspace. Most functionality
provided by an opearating system should be treated
as a service instead of explicitly pinning it down
as a userspace daemon or a kernel driver. Currently,
due to the arbitrarily difference in programming
interface names, functionality must be explicitly
ported between the kernel and userspace if it is
to run in one or the other environment. By unifying
the environments where possible, the arbitrary
division is weakened and porting between these
environments becomes simpler.
Antti Kantee has been a NetBSD developer for many
many moons. He has managed to work on quite a few
bits and pieces of a BSD system: userland utilities,
the pkgsrc packaging system, networking, virtual
memory, device drivers, hardware support and file
systems.
See also http://www.netbsd.org/docs/puffs/rump.htm
EuroBSDCon 2008 - Brooks Davis - Isolating cluster jobs for performance and predictability
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, freebsd, cluster, brooks davis
MP3 (1 byte, 51 minutes), OGG (1 byte, 51 minutes), PDF (1 byte, n pages)
The Aerospace Corporation operates a federally
funded research and development center in support
of national-security, civil and commercial space
programs. Many of our 2400+ engineers use a variety
of computing technologies to support their work.
Applications range from small models which are
easily handled by desktops to parameter studies
involving thousands of cpu hours and traditional,
large scale parallel codes such as computational
fluid dynamics and molecular modeling applications.
Our primary resources used to support these large
applications are computing clusters. Our current
primary cluster, the Fellowship cluster consists
of 352 dual-processor nodes with a total of 14xx
cores. Two additional clusters, beginning at 150
dual-processor nodes each are being constructed to
augment Fellowship. As in In any multiuser computing
environment with limited resources, user competition
for resources is a significant burden. Users want
everything they need to do their job, right now.
Unfortunately, other users may need those resources
at the same time. Thus, systems to arbitrate this
resource contention are necessary. On Fellowship
we have deployed the Sun Grid Engine scheduler which
scheduled batch jobs across the nodes. In the next
section we discuss the performance problems that
can occur when sharing resources in a high performance
computing cluster. We then discuss range of
possibilities to address these problems. We then
explain the solutions we are investigating and
describe our experiments with them. We then conclude
with a discussion of future work.
EuroBSDCon 2008 - Constantine Murenin - OpenBSD Hardware Sensors Framework
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, openbsd, hardware sensors, constantine murenin
MP3 (1 byte, 47 minutes), OGG (1 byte, 47 minutes), PDF (1 byte, n pages)
In this talk, we will discuss the past and present
history and the design principles of the OpenBSD
hardware sensors framework. Sensors framework
provides a unified interface for storing, registering
and accessing information about hardware monitoring
sensors. Sensor types include, but are not limited
to, temperature, voltage, fan RPM, time offset and
logical drive status. The framework spans
sensor_attach(9), sysctl(3), sysctl(8), sensorsd(8),
ntpd(8), snmpd(8) and more than 67 drivers, ranging
from I2C temperature sensors and Super I/O hardware
monitors to IPMI, RAID and SCSI enclosures. Several
third-party tools are also available, for example,
a plug-in for Nagios and ports/sysutils/symon.
Originally based on some ideas from NetBSD, the
framework has sustained many improvements in OpenBSD,
and was ported and committed to FreeBSD and DragonFly
BSD.
Constantine A. Murenin is an MMath graduate student
at the David R. Cheriton School of Computer Science
at the University of Waterloo (CA). Prior to his
graduate appointment, Constantine attended and
subsequently graduated from East Carolina University
(US) and De Montfort University (UK), receiving two
bachelor degrees in computer science, with honors
and honours respectively. A FreeBSD Google Summer
of Code 2007 Student, OpenBSD Committer and Mozilla
Contributor, Constantine's interests range from
standards compliance and usability at all levels,
to quiet computing and hardware monitoring.
http://Constantine.SU/
EuroBSDCon 2008 - Edd Barret - Modern Typesetting on BSD
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, typesetting, bsd, edd barrett
MP3 (1 byte, 33 minutes), OGG (1 byte, 33 minutes), PDF (1 byte, n pages)
Edd Barrett will speak about using the BSD Platform
as a means of typesetting from a practical standpoint
at EuroBSDcon 2008. Edd Barrett does not wish to
go into the technicalities of each typesetter, but
rather state which are good for certain types of
document, and which tools (ports and packages),
integrate well with the available typesetters.
Edd Barrett os a student from the UK, currently on
"placement year" as a systems administrator for
Bournemouth University. Open Source *NIX has been
his platform of choice for many years and he has
been using OpenBSD for about 3 years now, simply
because it is small, clean, correct and secure.
Just recently he has started developing things I
want or need for OpenBSD.
EuroBSDCon 2008 - George Neville-Neil - Four years of summer of code
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, google soc, george neville-neil
MP3 (1 byte, 27 minutes), OGG (1 byte, 27 minutes), PDF (1 byte, n pages)
The Google Summer of Code is a program designed to
provide students with real world experience
contributing to open source projects during the
summer break in university studies. Each year Google
selects a number of open source projects to act as
mentoring organizations. Students are invited to
submit project proposals for the open source projects
that are most interesting to them. FreeBSD was one
of the projects selected to participate in the
inaugural Summer of Code in 2005 and we have
participated each year since then. Over the past 4
years a total of 79 students have participated in
the program and it has become a very significant
source of new committers to FreeBSD. This talk will
examine in detail the selection criteria for projects,
the impact that successful projects have had, and
some suggestions for how we can better leverage
this program in the future.
EuroBSDCon 2008 - George Neville-Neil - Multicast Performance in FreeBSD
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, multicast, freebsd, george neville-neil
MP3 (1 byte, 39 minutes), OGG (1 byte, 39 minutes), PDF (1 byte, n pages)
In the past ten years most of the research in network
protocols has gone into TCP, leaving UDP to languish
as a local configuration protocol. While the majority
of Internet traffic is TCP, UDP remains the only
IP protocol that works over multicast and as such
has some specific, and interesting uses in some
areas of computing. In 2008 we undertook a study
of the performance of UDP multicast on both 1Gbps
and 10Gbps Ethernet networks in order to see if
changing the physical layer of the network would
give a linear decrease in packet latency. To measure
the possible gains we developed a new network
protocol test program, mctest, which is capable of
recording packet round trip times from many hosts
simultaneously and which we believe accurately
represents how many environments use multicast. The
mctest program has been integrated into FreeBSD and
is now being used to verify the proper operation
of multicast on various pieces of 10Gbps hardware.
EuroBSDCon 2008 - Hauke Fath - Managing BSD desktop clients - Fencing in the herd
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, bsd, desktop, hauke fath
MP3 (1 byte, 50 minutes), OGG (1 byte, 50 minutes), PDF (1 byte, n pages)
The members of the BSD family have traditionally
prospered off the desktop, as operating systems on
servers and embedded systems. The advent of MacOS
X has marked a change, and moved the desktop more
into focus. Modern desktop systems create a richer
software landscape, with more diverse requirements,
than their server counterparts. User demands,
software package interdependencies and frequent
security issues result in a change rate that can
put a considerable load on the admin staff. Without
central management tools, previously identical
installations diverge quickly. This paper looks at
concepts and strategies for managing tens to hundreds
of modern, Unix-like desktop clients. The available
management tools range from simple, image-based
software distribution, mainly used for setting up
uniform clients, to "intelligent" rule-based engines
capable of search-and-replace operations on
configuration files. We will briefly compare their
properties and limitations, then take a closer look
at Radmind, a suite for file level administration
of Unix clients. Radmind has been in use in the
Institute of Telecommunication at Technische
Universitt Darmstadt for over three years, managing
NetBSD and Debian Linux clients in the labs as well
as faculty members' machines. We will explore the
Radmind suite's underlying concepts and functionality.
In order to see how the concept holds up, we will
discuss real-world scenarios from the system
life-cycle of Installation, configuration changes,
security updates, component updates, and system
upgrades.
Hauke Fath works as a systems administrator for the
Institut fr Nachrichtentechnik (telecommunication)
at Technische Universitt Darmstadt. He has been
using NetBSD since 1994, when he first booted a
NetBSD 1.0A kernel on a Macintosh SE/30. NetBSD
helped shaping his career by causing a slow drift
from application programmer's work towards systems
and network administration. Hauke Fath holds a MS
in Physics and became a NetBSD developer in late
2006.
Keywords: Managing Unix desktop clients, software
distribution, tripwire
EuroBSDCon 2008 - Ion-Mihai Tetcu - Improving FreeBSD ports/packages quality
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, freebsd, ports, packages, ion-mihai tetcu
MP3 (1 byte, 56 minutes), OGG (1 byte, 56 minutes), PDF (1 byte, n pages)
This talk is focused on ways to improve the quality
of FreeBSD's ports and packages and it's partially
based on the 5 months experience of writing and
running the consecutive versions of "QA Tindy".
Ion-Mihai "IOnut" Tetcu is a 28 years old FreeBSD
ports committer and maintains about 40 ports scattered
in the Ports Tree. He lives in Bucharest, Romania
where he runs and co-owns an IT& company and he's
a member of Romanian FreeBSD and FreeUnix User Group
(RoFUG). His non-IT interests include history,
philosophy and mountain climbing.
EuroBSDCon 2008 - Joerg Sonnenberger - Sleeping beauty - NetBSD on Modern Laptops
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, netbsd, laptops, joerg sonnenberger
MP3 (1 byte, 54 minutes), OGG (1 byte, 54 minutes), PDF (1 byte, n pages)
This paper discusses the NetBSD Power Management
Framework (PMF) and related changes to the kernel.
The outlined changes allow NetBSD to support essential
functions like suspend-to-RAM on most post-Y2K X86
machines. They are also the fundation for intelligent
handling of device activity by enabling devices
on-demand. This work is still progressing. Many of
the features will be available in the up-coming
NetBSD 5.0 release The NetBSD kernel is widely
regarded to be one of the cleanest and most portable
Operating System kernels available. For various
reasons it is also assumed that NetBSD only runs
well on older hardware. In the summer of 2006 Charles
Hannum, one of the founders of NetBSD, left with a
long mail mentioning as important issues the lack
of proper power management and suspendto- RAM
support. One year later, Jared D. McNeill posted a
plan for attacking this issue based on ideas derived
from the Windows Driver Model. This plan would
evolve into the new NetBSD Power Management Framework
(PMF for short).
EuroBSDCon 2008 - Martin Schuette - Improved NetBSD Syslogd
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, netbsd, syslogd, martin schuette
MP3 (1 byte, 42 minutes), OGG (1 byte, 42 minutes), PDF (1 byte, n pages)
Martin Schuette has three main goals, defined by three
internet drafts to implement:
- TLS transport is the most obvious improvement: it
provides a reliable network transport with data encryption
and peer authentication. To make full use of this a
buffering mechanism to bridge temporary network errors
is implemented as well.
- Syslog-protocol extends the message format to use
a complete timestamp, include a fully qualified domain
name, and allow UTF-8 messages. It also offers a
structured data field to unambiguously encode application
dependent information.
- Syslog-sign will allow any syslog sender to digitally
sign its messages, so their integrity can be verified
later. This enable the detection of loss, deletion or
other manipulation syslog data after network transfer
or archiving on storage media.
Martin Schuette is a student of computer science in
Potsdam, Germany, and has been working as a part-time
system administrator for BSD servers since 2004.
In 2007 Martin Schuette already gave a talk on Syslog
at the Chemnitze Linux-Tage
(http://chemnitzer.linux-tage.de/2007/vortraege/detail.html?idx=547
in german; for a newer english version see these slides
for a seminar talk:
http://fara.cs.uni-potsdam.de/~mschuett/uni/syslog-protocols-080522.pdf).
EuroBSDCon 2008 - Matthieu Herrb - Input handling in wscons and X.Org
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, wscons, x.org, matthieu herrb
MP3 (1 byte, 57 minutes), OGG (1 byte, 57 minutes), PDF (1 byte, n pages)
This talk will present the different layers that
handle input, from the key that gets pressed or the
mouse motion to the applications, all the way through
the kernel drivers, X drivers and libraries, in the
case of the OpenBSD/NetBSD wscons driver and the
current and future X.Org server. It will cover stuff
like keyboard mappings, touch-screen calibration,
multi-pointer X or input coordinates transformations.
It will show some problems of current implementations
and try to show how current evolutions can solve
them.
Matthieu Herrb is maintaing X on OpenBSD. I've been
using X on various systems (SunOS, NetBSD, OpenBSD,
Mac OS X,...) since 1989. He has been a member of
the XFree86 Core Team for a short period in 2003
and is now a member of the X.Org Foundation BoD.
Matthieu Herrb works at LAAS a research laborarory
of the French National Research Agency (CNRS) both
on robotics and network security.
EuroBSDCon 2008 - Michael Dexter - Zen and the Art of Multiplicity Maintenance: An applied survey of BSD-licensed multiplicity strategies from chroot to mult
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, bsd, michael dexter
MP3 (1 byte, 38 minutes), OGG (1 byte, 38 minutes), PDF (1 byte, n pages)
Many BSD-licensed strategies of various levels of
maturity exist to implement multiplicity, herein
defined as the introduction of plurality to
traditionally singular computing environments via
isolation, virtualization, or other method. For
example, the chroot utility introduces an additional
isolated root execution environment within that of
the host; or an emulator provides highly-isolated
virtual systems that can run complete native or
foreign operating systems. Motivations for multiplicity
vary, but a demonstrable desire exists for users
to obtain root or run a foreign binary or operating
system. We propose a hands-on survey of portable
and integrated BSD-licensed multiplicity strategies
applicable to the FreeBSD, OpenBSD, DragonFlyBSD
and NetBSD operating systems on the i386 architecture.
We will also address three oft-coupled disciplines:
software storage devices, the installation of
operating system and userlands in multiplicity
environments plus the management of select multiplicity
environments. Finally we will comment on each
strategies potential limits of isolation, compatibility,
independence and potential overhead in comparison
to traditional systems. Keywords: multiplicity,
virtualization, chroot, jail, hypervisor, xen,
compat.
Michael Dexter has used Unix systems since 1991 and
BSD-licensed multiplicity strategies for over five
years. He is the Program Manager at the BSD Fund
and Project Manager of the BSD.lv Project.
EuroBSDCon 2008 - Nick Barkas - Dynamic memory allocation for dirhash in UFS2
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, ufs2, nick barkas
MP3 (1 byte, 32 minutes), OGG (1 byte, 32 minutes), PDF (1 byte, n pages)
Hello My name is Nick Barkas. I'm a master's student
studying scientific computing at Kungliga Tekniska
hgskolan (KTH) in Stockholm, Sweden. I have just
begun work on a Google Summer of Code project with
FreeBSD: Dynamic memory allocation for dirhash in
UFS2 . I would like to present my results from
this project at EuroBSDCon this year. This project
is very much a work in progress now so it is a bit
difficult to summarize what I would ultimately
present. I will try to describe an outline, though.
First I will give background information on dirhash:
an explanation of the directory data structure in
UFS2, how directory lookups in this structure
necessitate a linear search, and how dirhash speeds
these lookups up without having to change anything
about the directory data structure. Next I will
explain the current limitation that dirhash's maximum
memory use must be manually specified by administrators,
or left at a small conservative default of 2MB. I
will explain some different methods I will have
explored to try and make this maximum memory limit
dynamically increase and decrease as the system has
more or less free memory, and which method I will
have ultimately settled on and implemented. Then
I'll present some test results of performance of
operations on very large directories with and without
dynamic memory allocation enabled for dirhash. Next
I will talk about how speed gains from dirhash are
limited by the fact that the hash tables exist only
in memory and must be recreated after each system
boot, as big directories are scanned for the first
time, or even have to be recreated for a directory
that has not been scanned in some time if its dirhash
has been discarded to free memory. These problems
can be eliminated by using an on-disk index for
directory entries. I will talk about some of the
challenges of implementing on-disk indexing, such
as remaining backwards compatible with older versions
of UFS2 and interoperating properly with softupdates.
Then, if my SoC project has permitted me time to
work on this aspect of it, I will explain some
possible methods for adding directory indexing to
UFS2 that meets these challenges, and which of those
ideas I will have implemented. Finally I will present
results of some benchmarks on this filesystem with
indices, and compare to performance with dirhash,
and with no indices or dirhashes.
Keywords: dirhash, ufs2, filesystems, performance tuning
EuroBSDCon 2008 - Paeps Philip - How-to embed FreeBSD
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, embed, freebsd, philip paeps
MP3 (1 byte, 43 minutes), OGG (1 byte, 43 minutes), PDF (1 byte, 17 pages)
This paper provides a how-to embed FreeBSD. A console
server built form an AT91RM9200 based ARM system
will be explored. This paper will talk about the
selection of hardware. It will explore creating
images for the target system, as well as concentrate
on different alternatives for deploying the system.
A number of different options exist today, and no
comprehensive guide for navigating through the
choices exists today. This paper will explore the
different alternatives that exist today for producing
images targeted at different size requirements. The
differing choices for storage in an embedded
environment are explored. The techniques used to
access rich debugging environments are discussed.
EuroBSDCon 2008 - Paul Richards - eXtreme Programming: FreeBSD a case study
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, freebsd, extreme programming, paul richards
MP3 (1 byte, 54 minutes), OGG (1 byte, 54 minutes), PDF (1 byte, n pages)
Traditional project management methodologies are
typically based on the waterfall model where there
are distinct phases: requirements capture, design,
implementation, testing, delivery. Once a project
has moved on to the next phase there is no going
back. The end result is often a late project that
no-one wants anymore because the requirements have
fundamentally changed by the time the project is
delivered.
EuroBSDCon 2008 - Pedro Giffuni - Working with Engineering Applications in FreeBSD
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, freebsd, engineering applications, pedro giffuni
MP3 (1 byte, 51 minutes), OGG (1 byte, 51 minutes), PDF (1 byte, n pages)
In recent years, traditional branches of engineering
like Civil, Chemical, Mechanical, Electrical and
Industrial Engineering are requiring extensive
computing facilities for their needs. Several well
known labs (Sandia, Lawrence Livermore) rely on
huge clusters to do all types of complex analysis
that were unthinkable a couple of decades ago. While
the free BSD variants share the environment with
traditional UNIX systems, frequently used for such
computations, it was not common to find adequate
free software packages to carry complex calculations.
Eventually commercial versions of important math
related packages started to appear for the Linux
platform. Even when the big packages were distant,
the BSDs learned and adapted in resourceful ways:
Matlab and Mathematica, running under Linux emulation,
demanded functionality from the BSDs and NetBSD
implemented a signal trampoline to be able to run
AutoCAD with IRIX binary compatibility. A notable
project that was always available under a free
license was Berkeley's Spice circuit analysis
program, however it was an exception rather than
the rule. Even when the scientific community pressed
for a while to get other important tools like NASA's
FEA package Nastran under a free license, the
objective of being able to access and enhance open
scientific tools was elusive. About a decade ago
the situation started to improve: FreeBSD's ports
system started growing exponentially, first with a
high content in the math category, afterwards with
a CAD section and after sustained growth in those
categories a science section was created. This
growth was mostly pushed by Universities and their
research projects and in general are not well known
with respect to the commercial counterparts. I
started porting math/engineering code for FreeBSD
around 1996. Back then it was absolutely unthinkable
for a Mechanical Engineer to depend only on FreeBSD
for it's daily work. The situation nowadays is
different: there are some very high quality engineering
analysis packages like EDF's Code Aster, with more
than 12 years of professional development, that
just can't be ignored. A Finite Element package,
like Code Aster, can easily cost 5000 US$, is priced
according to the maximum problem size it can solve,
can require yearly licenses, and is rarely available
with source code. In NASTRAN's case the source code
is only available for US citizens under a yearly
fee. Free software does have serious limitations
though; just like in office applications there are
proprietary CAD formats or sometimes the package
simply doesn't have the required functionality.
Having the sources, of course, always has the
advantage of being able to implement (or pay for)
some specific functionality you might need. Many
commercial packages have been recently ported to
Linux, but even when they gain some of the advantages
of an open environment they still have yet another
limitation: they have been very slow to make use
of the multicored features of the new processors
in the market, a huge limitation now that the speed
war between processors has been limited by the
overheating problem. The objective of the talk is
to give an overview of several CAD/CAE packages
that have been made available recently as part of
FreeBSD's ports system and the decisions that were
made to port them. BRLCAD and Varkon are two CAD
utilities that made a transition from closed source
to an open environment and in the process in the
process of getting ported to BSD have gained greater
portability and general "bug" fixes critical for
their consolidation as usable and maintainable
projects. There are also some tricks that have not
been well documented: it is possible to enable
threads and some extra optimizations on some packages,
and it is also possible to replace the standard
BLAS library with the faster GOTO BLAS without
rebuilding the package. It is also possible to build
the packages optimized for a clustered environment,
but perhaps what is most interesting of all is how
all the packages interrelate with each other and
can turn FreeBSD into a complete enginering
environment. No OS distribution so far is offering
all the engineering specific utilities offered
through FreeBSD's ports system: from design to
visualization, passing through analysis FreeBSD is
becoming an option that can't be ignored, and best
of all, it is an effort that will benefit not only
FreeBSD but the wider audience.
Pedro F. Giffuni M. Sc. Industrial Engineering -
University of Pittsburgh Mechanical Engineer -
Universidad Nacional de Colombia I was born in
Bogota, Colombia but I am an Italian citizen. My
experience with computers started when I was about
12 years old With the TRS-80 Color Computer first
using Basic and the OS-9. I studied electronics for
3 years but became tired of worrying about "whatever
happened to electrons in there" and moved to
Mechanical Engineering. For a while I rested from
the computer world until the Internet came stepping
along. I started using FreeBSD around 1995 and soon
fell in love with the idea of being able to install
a complete version of UNIX from the net with just
one floppy. After submitting a the 999th port to
the FreeBSD project Walnut Creek was kind enough
to give me a subscription for several years to
FreeBSD's CD-ROM. Since then I've been on and off
porting software packages or fixing the bugs I have
caused while porting them. Of course there has
always been great respect for the other BSDs and
their wonderful license and while I've given up on
the idea of one day seeing a "UnifiedBSD" I am glad
to see different approaches sharing ideas in a
healthful environment.
Keywords: BSD, engineering, CAE, CAD, math, mechanical,
FreeBSD ports
EuroBSDCon 2008 - Robert Watson - FreeBSD Network Stack Performance Optimizations for Modern Hardware
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, freebsd, network stack, hardware, robert watson
MP3 (1 byte, 53 minutes), OGG (1 byte, 53 minutes), PDF (1 byte, n pages)
The arrival of high CPU core density, with commodity
quad-core notebooks and 32-core servers, combined
with 10gbps networking have transformed network
design principles for operating systems. This talk
will describe changes in the FreeBSD 6.x, 7.x, and
forthcoming 8.x network stacks required to exploit
multiple cores and serve 10gbps networks. The goal
of the session will be to introduce the audience
to general strategies used to improve performance,
their rationales, and their impact on applications
and users:
- Introduction to the SMPng Project and the follow-on Netperf Project
- Workloads and performance measurement
- Efficient primitives to support modern network stacks
- Multi-core and cache-aware network memory allocator
- Fine-grained network stack locking
- Load-balancing and contention-avoidance across multiple CPUs
- CPU affinity for network stack data structures
- TCP performance enhancements including TSO, LRO, and TOE
- Zero-copy Berkely Packet Filter (BPF) buffers
- Direct network stack dispatch from interrupt handlers
- Multiple input and output queues
Robert Watson is a researcher at the University of
Cambridge Computer Laboratory investinging operating
system and network security. Prior to joining the
Computer Laboratory to work on a PhD, he was Senior
Principal Scientist at McAfee Research, now SPARTA
ISSO, a leading security research and development
organization, directing government and commercial
research contracts for customers that include DARPA,
the US Navy, and Apple Computer. His research
interests include operating system security, network
stack structure and performance, and windowing
system structure. He is also a member of the FreeBSD
Core Team and president of the FreeBSD Foundation.
EuroBSDCon 2008 - Russel Sutherland - UTORvpn: A BSD based VPN service for the masses
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, freebsd, vpn, russel sutherland
MP3 (1 byte, 52 minutes), OGG (1 byte, 52 minutes), PDF (1 byte, n pages)
The University of Toronto is a large educational
institutional with over 70,000 students and 10,000
staff and faculty. For the past three years, we
have developed and implemented a ubiquitous VPN
service, based up on OpenVPN and FreeBSD. The service
has over 3000 active customers, with up to 35
simultaneous users. The system supports, Linux, Mac
OS X and Windows XP/Vista/2000 clients. Tools have
been developed to create a central CA which enables
users to log in to a secure server and get their
customized client, certificates and configuration.
The NSIS installer is used to generate the customized
windows installers. Similar packages are generated
for the various Unix based clients. Additional
WWW/PHP based tools, have been developed to monitor
and log usage of the service, using standard graphs,
alarms for excessive use and a certificate revocation
mechanism. The system has been integrated into the
local identity management system (Kerberos/LDAP)
in order to authorize and authenticate users upon
initiation and per session usage. All code is Open
Source and freely available.
EuroBSDCon 2008 - Yvan Vanhullebus - IPSec tools: past, present and future
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, ipsec, yvan vanhullebus
MP3 (1 byte, 46 minutes), OGG (1 byte, 46 minutes), PDF (1 byte, n pages)
The first part will explain what have been major
changes since Manu's presentation at Bale's EuroBSDCon,
including more detailed informations on changes
which have a significant impact on administrator's
bad habits (why the common way of doing it is bad,
why it was sometimes needed in the past, how to do
it the good way now, why this is far better), on
both the UserLand (ipsec-tools project) and maybe
in [Free|Net]BSD kernels/ IPSec stacks.
The second part will talk about the future of the
project. News of the next major version (which may
be out or about to be out when we'll be ate
EuroBSDCon), news works which are planned or which
are done but not yet public, but also news about
the team: it's new members, new tools, what we would
like to do in tue future, a
Yvan VANHULLEBUS works as an R&D security engineer
for NETASQ since 2000, where he works on FreeBSD
OS. He started to work on KAME's IPSec stack in
2001, provided many patches for various parts of
the stack, then became one of the maintainers of
ipsec-tools project, a fork of KAME's userland
daemon. He became a NetBSD developper when ipsec-tools
was migrated to NetBSD's CVS.
EuroBSDCon 2008 Keynote - George Neville-Neil - Thinking about thinking code
Source: EuroBSDCon
Added: 22 October 2008
Tags: eurobsdcon, eurobsdcon2008, george neville-neil
MP3 (1 byte, 37 minutes), OGG (1 byte, 37 minutes), PDF (1 byte, n pages)
EuroBSDCon 2008 Keynote - George Neville-Neil - Thinking about thinking code
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