OpenBSD Multimedia Resources List
Links on this page refer to multimedia resources (podcast, vodcast,
audio recordings, video recordings, photos) related to OpenBSD or
of interest for OpenBSD 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.
DragonFlyBSD 2.8 with Matthew Dillon
Added: 06 November 2010
Tags: bsdtalk, interview, meetbsd, meetbsd2010, dragonflybsd, matthew dillon
Ogg version (15 minutes), MP3 version (7 Mb, 15 minutes)
Interview from MeetBSD California 2010 with Matthew
Dillon about the recent 2.8 release of DragonFlyBSD.
More information at http://www.dragonflybsd.org/
DragonFlyBSD with Matthew Dillon
Added: 07 January 2010
Tags: bsdtalk, interview, dragonflybsd, matthew dillon
Ogg version (34 minutes), MP3 version (16 Mb, 34 minutes)
An interview with Matthew Dillon. We talk about
recent developments in DragonFlyBSD.
Justin Sherrill of the DragonFlyBSD Digest
Added: 19 January 2009
Tags: bsdtalk, interview, dragonflybsd, justin sherril
Ogg version (22 minutes), MP3 version (10 Mb, 22 minutes)
Interview with Justin Sherrill of the DragonFlyBSD
Digest, which can be found at
Added: 16 August 2007
Tags: bsdtalk, interview, dragonflybsd, mattew dillon
Ogg version (20 minutes), MP3 version (10 Mb, 20 minutes)
Interview with DragonflyBSD's Matthew Dillon. We
talk about the 1.10 release and the design of a new
DragonFlyBSD Developer Matthew Dillon
Added: 08 February 2007
Tags: bsdtalk, interview, dragonflybsd, mathew dillon
Ogg version (24 minutes), MP3 version (12 Mb, 24 minutes)
Interview with DragonFlyBSD developer Matthew Dillon.
We talk about the 1.8 release.
Robert Luciani - M:N threading in DragonflyBSD
Added: 24 May 2009
Tags: dcbsdcon, dcbsdcon2009, slides, dragonflybsd, concurrency, robert luciani
PDF (1.5 Mb, 23 pages)
Ineffective concurrency mechanisms in an operating
system can lead to low performance in both single
and multiprocessor environments. Practical setbacks
involved with attempting overly invasive kernel
changes have made it difficult in the past to
implement new and innovative concurrency systems.
This paper describes the rationale behind interfaces
in the DragonFly BSD operating system intended to
provide high performance and scalability on
multiprocessor architectures. Using a lock-free
processor centric approach, DragonFly BSD has
developed a unique thread system with the potential
for excellent scalability.
EuroBSDCon 2008 - Aggelos Economopoulos - An MP-capable network stack for DragonFlyBSD with minimal use of locks
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.