From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Robert Bradbury <robert.bradbury@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Broken ondemand scheduler in Linux 2.6.30+ on Pentium IVs
Date: Mon, 26 Oct 2009 18:19:34 +0000 [thread overview]
Message-ID: <20091026181934.GA4657@srcf.ucam.org> (raw)
In-Reply-To: <deaa866a0910251546m7ea001bcm252c41e65927a424@mail.gmail.com>
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@srcf.ucam.org
next prev parent reply other threads:[~2009-10-26 18:19 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-25 22:46 Broken ondemand scheduler in Linux 2.6.30+ on Pentium IVs Robert Bradbury
[not found] ` <20091026015755.7482.qmail@stuge.se>
2009-10-26 11:50 ` Robert Bradbury
2009-10-26 18:19 ` Matthew Garrett [this message]
2009-10-26 18:23 ` Matthew Garrett
2009-10-27 0:44 ` Robert Hancock
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20091026181934.GA4657@srcf.ucam.org \
--to=mjg59@srcf.ucam.org \
--cc=linux-kernel@vger.kernel.org \
--cc=robert.bradbury@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.