[TEST/REVIEW] CPU accounting patches

Kevin Oberman oberman at es.net
Fri Jan 27 08:56:48 PST 2006

> Date: Fri, 27 Jan 2006 04:03:14 -0500
> From: Mike Jakubik <mikej at rogers.com>
> Sender: owner-freebsd-current at 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
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634

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