Re: cvs commit: src/sys/kern subr_pcpu.c

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From
Bernd Walter <ticso@cicely12.cicely.de>
Date
30 Sep 2005 12:49:15
Subject
Re: cvs commit: src/sys/kern subr_pcpu.c
Message-ID
20050930124802.GF54923@cicely12.cicely.de


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On Fri, Sep 30, 2005 at 05:28:59AM +1000, Peter Jeremy wrote:
> On Thu, 2005-Sep-29 19:46:02 +0200, Wilko Bulte wrote:
> >> I remember my old sparcstation hardware at CMU with some fondness for this
> >> reason -- on a cold Pittsburgh evening, overheating computer hardware was
> >> strictly necessary, even in the presence of decent radiators. However,
> >> with 14+ cooling fans for one machine, it did need to be a couple of rooms
> >> down.
> >
> >Hum, yes. That is why I handed down my AS4100 to ticso ;)
>
> Compared to ES40/ES45's, AS4100's run very cool and I think they're quieter.

A major difference is that EV6 CPUs have more advanced power management
features, while the EV56 in AS4100 even burn lots of power when idle :(
But there is still much we could do from software to spare power on all
alpha systems - I plan to do measurements with idle-loops soon.
Yes - AS4100 are quitely, you don't really hear much from it in my server
room.
But I don't have to pay for noise, power is the critical point.

> If you want to warm things up, try a 42U cabinet full of SunFire V440's.

:)

--
B.Walter BWCT http://www.bwct.de
bernd@bwct.de info@bwct.de



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