LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
To: "Pierre Ossman" <drzeus-list@drzeus.cx>, "Len Brown" <lenb@kernel.org>
Cc: <linux-pm@lists.linux-foundation.org>,
"Pavel Machek" <pavel@ucw.cz>,
"LKML" <linux-kernel@vger.kernel.org>,
"Adam Belay" <abelay@novell.com>,
"Andi Kleen" <andi@firstfloor.org>,
"Lee Revell" <rlrevell@joe-job.com>
Subject: RE: [linux-pm] [PATCH] cpuidle: avoid singing capacitors
Date: Thu, 13 Mar 2008 09:47:30 -0700 [thread overview]
Message-ID: <924EFEDD5F540B4284297C4DC59F3DEEB33CDD@orsmsx423.amr.corp.intel.com> (raw)
In-Reply-To: <20080313173437.5f00f70e@mjolnir.drzeus.cx>
>-----Original Message-----
>From: linux-kernel-owner@vger.kernel.org
>[mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of Pierre Ossman
>Sent: Thursday, March 13, 2008 9:35 AM
>To: Len Brown
>Cc: linux-pm@lists.linux-foundation.org; Pavel Machek; LKML;
>Adam Belay; Andi Kleen; Lee Revell
>Subject: Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors
>
>On Wed, 12 Mar 2008 15:11:17 -0400
>Len Brown <lenb@kernel.org> wrote:
>
>> >
>> > So for now, the only viable workaround is processor.max_cstate....
>>
>> yup, that's why we put it in. Is it insufficient?
>>
>
>For some value of insufficient. It is sub-optimal. I'm hoping
>there is a way to enter C3 in a pattern that avoids the noise
>and still gives a reduced power usage.
>
Can you try using /dev/cpu_dma_latency from an user space application.
Refer Documentation/pm_qos_interface.txt for usage. With this interface
you can change menu governor behavior from userspace, by dynamically
allowing it to use C3 or not. I am thinking that something like allowing
C3 for few seconds and blocking it for few seconds may help.
Thanks,
Venki
next prev parent reply other threads:[~2008-03-13 17:00 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-29 18:38 [RFC][PATCH] " Pierre Ossman
2008-02-29 21:44 ` Lennart Sorensen
2008-03-01 12:31 ` Pierre Ossman
2008-03-01 13:40 ` Pierre Ossman
2008-03-02 2:27 ` Lee Revell
2008-03-02 14:17 ` Pierre Ossman
2008-03-03 12:36 ` Andi Kleen
2008-03-03 20:18 ` [PATCH] " Pierre Ossman
2008-03-03 20:46 ` Pavel Machek
2008-03-03 21:03 ` Pierre Ossman
2008-03-03 21:08 ` Pavel Machek
2008-03-03 21:14 ` Pallipadi, Venkatesh
2008-03-03 21:17 ` Pierre Ossman
2008-03-03 22:04 ` Pallipadi, Venkatesh
2008-03-03 23:05 ` [linux-pm] " Alan Stern
2008-03-03 23:10 ` Andi Kleen
2008-03-04 4:00 ` Dave Jones
2008-03-04 6:14 ` Pierre Ossman
2008-03-04 17:19 ` Pierre Ossman
2008-03-04 17:29 ` Andi Kleen
2008-03-04 17:30 ` Pierre Ossman
2008-03-04 17:43 ` Andi Kleen
2008-03-04 18:04 ` Pierre Ossman
2008-03-04 18:34 ` Andi Kleen
2008-03-05 6:04 ` Pierre Ossman
2008-03-05 15:48 ` Andi Kleen
2008-03-05 16:53 ` Pierre Ossman
2008-03-05 17:32 ` Andi Kleen
2008-03-04 19:01 ` Pallipadi, Venkatesh
2008-03-05 6:02 ` Pierre Ossman
2008-03-05 8:40 ` Pierre Ossman
2008-03-05 9:03 ` Pavel Machek
2008-03-05 13:42 ` Pierre Ossman
2008-03-05 13:47 ` Pavel Machek
2008-03-05 13:52 ` Pierre Ossman
2008-03-06 8:27 ` Pierre Ossman
2008-03-09 14:16 ` Pierre Ossman
2008-03-09 18:19 ` Rafael J. Wysocki
2008-03-09 18:50 ` Alan Stern
2008-03-09 19:30 ` Henrique de Moraes Holschuh
2008-03-09 20:14 ` Pierre Ossman
2008-03-09 20:41 ` Henrique de Moraes Holschuh
2008-03-09 20:54 ` Henrique de Moraes Holschuh
2008-03-10 10:00 ` Pavel Machek
2008-03-10 12:49 ` Pierre Ossman
2008-03-10 13:04 ` Andi Kleen
2008-03-10 13:29 ` Pierre Ossman
2008-03-12 19:11 ` Len Brown
2008-03-13 8:10 ` Pavel Machek
2008-03-13 10:42 ` Andi Kleen
2008-03-14 4:13 ` Len Brown
2008-03-13 16:34 ` Pierre Ossman
2008-03-13 16:47 ` Pallipadi, Venkatesh [this message]
2008-03-13 17:44 ` Pierre Ossman
2008-03-13 17:49 ` Pierre Ossman
2008-03-14 19:40 ` Pierre Ossman
2008-03-14 21:15 ` Pallipadi, Venkatesh
2008-03-15 0:41 ` Pierre Ossman
2008-03-11 7:51 ` Pierre Ossman
2008-03-11 10:48 ` Andi Kleen
2008-03-11 15:20 ` Pierre Ossman
2008-03-11 17:31 ` Pierre Ossman
2008-03-12 19:17 ` Len Brown
2008-03-12 20:31 ` Len Brown
2008-03-04 9:40 ` Andi Kleen
2008-03-03 23:09 ` Andi Kleen
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=924EFEDD5F540B4284297C4DC59F3DEEB33CDD@orsmsx423.amr.corp.intel.com \
--to=venkatesh.pallipadi@intel.com \
--cc=abelay@novell.com \
--cc=andi@firstfloor.org \
--cc=drzeus-list@drzeus.cx \
--cc=lenb@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@lists.linux-foundation.org \
--cc=pavel@ucw.cz \
--cc=rlrevell@joe-job.com \
--subject='RE: [linux-pm] [PATCH] cpuidle: avoid singing capacitors' \
/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
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).