Date: Fri, 27 Jan 2006 08:56:44 -0800 From: "Kevin Oberman" <oberman@es.net> To: Mike Jakubik <mikej@rogers.com> Cc: John-Mark Gurney <gurney_j@resnet.uoregon.edu>, current@freebsd.org, Brian Candler <B.Candler@pobox.com>, Peter Jeremy <PeterJeremy@optushome.com.au>, arch@freebsd.org, Poul-Henning Kamp <phk@phk.freebsd.dk> Subject: Re: [TEST/REVIEW] CPU accounting patches Message-ID: <20060127165644.4F9F245083@ptavv.es.net> In-Reply-To: Your message of "Fri, 27 Jan 2006 04:03:14 EST." <43D9E1D2.6060207@rogers.com>
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> Date: Fri, 27 Jan 2006 04:03:14 -0500 > From: Mike Jakubik <mikej@rogers.com> > Sender: owner-freebsd-current@freebsd.org > > Brian Candler wrote: > > I guess this is OK, *if* you trust the power management system to do its job > > properly. Unfortunately I have very bad experiences of such things. In many > > cases I've ended up turning off power management completely and locking > > everything at max clock speed. Mind you, if I do that, anything you do with > > scaling factors isn't going to affect me, so actually I don't really care. > > I'll shut up now :-) > > > > Let's not forget, FreeBSD is really a server OS. Who in their right mind > uses power saving features on a server? It sounds nice in theory, but > doesn't work as well. Playing devil's advocate a bit, don't forget that thermal management will throttle performance even if it is set to maximum (as it should be on a compute server). This should never happen, but fans and air coolers do fail. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634
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