Date: Fri, 12 Jan 2007 11:41:14 +0100 From: Bruno Ducrot <ducrot@poupinou.org> To: George Hartzell <hartzell@alerce.com> Cc: Peter Jeremy <peterjeremy@optushome.com.au>, freebsd-stable@freebsd.org Subject: Re: saving power in a Dell Poweredge 750. Message-ID: <20070112104113.GO4945@poupinou.org> In-Reply-To: <17830.29230.895934.881569@rosebud.alerce.com> References: <17829.9117.888327.881204@rosebud.alerce.com> <20070110183643.GI832@turion.vk2pj.dyndns.org> <17829.13636.926529.357546@rosebud.alerce.com> <20070111105648.GK4945@poupinou.org> <17830.29230.895934.881569@rosebud.alerce.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thu, Jan 11, 2007 at 09:21:50AM -0800, George Hartzell wrote: > Bruno Ducrot writes: > > [...] > > What specific driver(s) were loaded actually? > > A devinfo might help. > > It looks like: > > p4tcc0 > cpufreq0 > > Here's a devinfo and a dmesg: > > http://shrimp.alerce.com/merlin/merlin.devinfo > http://shrimp.alerce.com/merlin/merlin.dmesg > > I'm starting to understand that the box is probably running along as > quietly as it knows how, unless there's some magic about fans and > disks that I've missed. > p4tcc0 reduce only frequency (actually it wont reduce the core frequency), but not core voltage. You actually wont save a lot of power with it. It's main usage is to reduce processor temperature if need be. The cpufreq0 actually is not a real driver. It's used to merge different drivers (for example p4tcc0 and est0 if your processor support SpeedStep) in order to provide an unified interface available via dev.cpu.0. Cheers, -- Bruno Ducrot -- Which is worse: ignorance or apathy? -- Don't know. Don't care.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20070112104113.GO4945>