From: Wes Felter <wesley@felter.org>
To: 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 15:05:45 -0600 [thread overview]
Message-ID: <4980C8A9.6090904@felter.org> (raw)
In-Reply-To: <603382.20833.qm@web59902.mail.ac4.yahoo.com>
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.
Clock modulation is quite simple; in the past I've done it from
userspace with /dev/cpu/*/msr or written my own module to do it. I don't
know if I've ever tried it on quad-cores, but it worked on dual-core
Woodcrest. (Note: I was not trying to save energy.)
Wes Felter - wesley@felter.org
next prev parent reply other threads:[~2009-01-28 21:06 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
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 [this message]
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=4980C8A9.6090904@felter.org \
--to=wesley@felter.org \
--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 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.