linux-kernel - Re: Broken ondemand scheduler in Linux 2.6.30+ on Pentium IVs

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Message-ID: <20091026181934.GA4657@srcf.ucam.org>
Date:	Mon, 26 Oct 2009 18:19:34 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Robert Bradbury <robert.bradbury@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Broken ondemand scheduler in Linux 2.6.30+ on Pentium IVs

The ondemand governor assumes that frequency transitions occur at low 
latency. This isn't usefully the case with p4-clockmod, and running 
ondemand there will generally show obvious performance regressions. If 
you have a recent enough P4 use the acpi-cpufreq driver instead. If not, 
the conservative governor should still work and is a better fit to the 
hardware.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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