From: Dave Jones <davej@redhat.com>
To: Xiaoning Ding <dingxn@ymail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: a question about p4_clockmod module on Xeon quad core processors
Date: Wed, 28 Jan 2009 16:02:00 -0500 [thread overview]
Message-ID: <20090128210200.GA19527@redhat.com> (raw)
In-Reply-To: <603382.20833.qm@web59902.mail.ac4.yahoo.com>
On Tue, Jan 27, 2009 at 12:17:25PM -0800, Xiaoning Ding wrote:
> Hi list,
>
> I have tried the p4-clockmod module in Linux kernel 2.6.29 on Xeon 5355 quad-core CPUs with no luck. It seems current p4-clockmod driver still cannot support Intel Quad core processors, right?
>
> I know I can also use acpi-cpufreq. It can only scale down the frequence from 2.67GHz to 2GHz. But I need some lower frequencies for some experiments.
p4-clockmod doesn't change the processor frequency.
Because of common misconceptions like this, the user interface has been removed.
In 2.6.29, the clock modulation code is called directly from ACPI
whenever thermal events indicate that throttling is necessary.
Dave
--
http://www.codemonkey.org.uk
next prev parent reply other threads:[~2009-01-28 21:02 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-27 20:17 a question about p4_clockmod module on Xeon quad core processors Xiaoning Ding
2009-01-27 21:23 ` Arjan van de Ven
2009-01-29 16:12 ` Xiaoning Ding
2009-01-28 21:02 ` Dave Jones [this message]
2009-01-29 2:06 ` Xiaoning Ding
2009-01-29 2:45 ` Dave Jones
2009-01-29 16:32 ` Xiaoning Ding
2009-01-29 17:08 ` Dave Jones
2009-01-29 12:27 ` Michael Tokarev
2009-01-29 17:24 ` Dave Jones
2009-01-29 19:40 ` Xiaoning Ding
2009-01-29 19:54 ` Dave Jones
2009-01-28 21:05 ` Wes Felter
2009-01-29 2:11 ` Xiaoning Ding
2009-01-29 20:47 ` Wes Felter
2009-01-30 1:12 ` Xiaoning Ding
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=20090128210200.GA19527@redhat.com \
--to=davej@redhat.com \
--cc=dingxn@ymail.com \
--cc=linux-kernel@vger.kernel.org \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox