Date: Fri, 30 Sep 2005 14:48:02 +0200 From: Bernd Walter <ticso@cicely12.cicely.de> To: Peter Jeremy <PeterJeremy@optushome.com.au> Cc: Wilko Bulte <wb@freebie.xs4all.nl>, src-committers@freebsd.org, cvs-all@freebsd.org, cvs-src@freebsd.org Subject: Re: cvs commit: src/sys/kern subr_pcpu.c Message-ID: <20050930124802.GF54923@cicely12.cicely.de> In-Reply-To: <20050929192859.GD72352@cirb503493.alcatel.com.au> References: <200509261655.j8QGtBeE012785@repoman.freebsd.org> <20050926174442.GA57238@xor.obsecurity.org> <20050926181234.GA23937@freebie.xs4all.nl> <20050927103746.364de995.trhodes@FreeBSD.org> <20050927184742.GB30441@freebie.xs4all.nl> <20050928044624.2e052569.trhodes@FreeBSD.org> <20050929161804.F34322@fledge.watson.org> <20050929174602.GA45515@freebie.xs4all.nl> <20050929192859.GD72352@cirb503493.alcatel.com.au>
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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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