linux-kernel - Re: + restore-missing-sysfs-max_cstate-attr.patch added to -mm tree

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Message-Id: <20071201021740.2e66b918.akpm@linux-foundation.org>
Date:	Sat, 1 Dec 2007 02:17:40 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mark Lord <lkml@....ca>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	abelay@...ell.com, lenb@...nel.org, mlord@...ox.com, rjw@...k.pl,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: + restore-missing-sysfs-max_cstate-attr.patch added to -mm tree

On Fri, 30 Nov 2007 22:14:08 -0500 Mark Lord <lkml@....ca> wrote:

> > latency. If your app cant take any latency, you should set those... and
> > the side effect is that the kernel will not do long-latency C-states or
> > P-state transitions..
> ..
> 
> I don't mind the cpufreq changing (actually, I want it to drop in cpugfreq
> to save power and keep the fan off), but the C-states just kill this app.

semi-OT: I was finding that disabling cpufreq altogether on the Vaio speeds up
`quilt push 1000' by a lot - around 30% iirc.

There do seem to be some unsophisticated decisions in there and we're losing quite
a bit of performance as a result.
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