From: Arjan van de Ven <arjan@infradead.org>
To: Corrado Zoccolo <czoccolo@gmail.com>
Cc: linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
lenb@kernel.org, mingo@elte.hu, yanmin_zhang@linux.intel.com,
jens.axboe@oracle.com, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Subject: Re: [PATCH v2] cpuidle: Fix the menu governor to boost IO performance
Date: Sun, 8 Nov 2009 14:39:08 -0800 [thread overview]
Message-ID: <20091108143908.78dd97a1@infradead.org> (raw)
In-Reply-To: <4e5e476b0911081359x32d7a6c4x61ee3af92dc0c8a1@mail.gmail.com>
On Sun, 8 Nov 2009 22:59:43 +0100
Corrado Zoccolo <czoccolo@gmail.com> wrote:
> Unfortunately, I have seen polling residency times > 1ms, so it must
> not be so accurate.
hmm I wonder if the timer hardware in use has a much larger
granularity than usecs...
because that rounding up could cost us dearly.
wonder if we should do some form of "check for timer expiry" as part of
the polling loop.. that'd cut latency way down as well ;)
--
Arjan van de Ven Intel Open Source Technology Centre
For development, discussion and tips for power savings,
visit http://www.lesswatts.org
prev parent reply other threads:[~2009-11-08 22:37 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-15 3:42 [PATCH v2] cpuidle: Fix the menu governor to boost IO performance Arjan van de Ven
2009-09-15 3:54 ` Andrew Morton
2009-09-15 4:15 ` Arjan van de Ven
2009-09-15 4:18 ` Arjan van de Ven
2009-09-15 5:03 ` Rik van Riel
2009-09-15 23:23 ` Andrew Morton
2009-09-16 4:35 ` Arjan van de Ven
2009-09-17 13:39 ` Arjan van de Ven
2009-11-04 9:39 ` Corrado Zoccolo
2009-11-08 20:40 ` Arjan van de Ven
2009-11-08 21:59 ` Corrado Zoccolo
2009-11-08 22:30 ` Arjan van de Ven
2009-11-09 13:29 ` Corrado Zoccolo
2009-11-08 22:39 ` Arjan van de Ven [this message]
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=20091108143908.78dd97a1@infradead.org \
--to=arjan@infradead.org \
--cc=akpm@linux-foundation.org \
--cc=czoccolo@gmail.com \
--cc=ink@jurassic.park.msu.ru \
--cc=jens.axboe@oracle.com \
--cc=lenb@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=yanmin_zhang@linux.intel.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox