From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Markus Trippelsdorf <markus@trippelsdorf.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Very high CPU values in top on idle system (3.0-rc1)
Date: Mon, 30 May 2011 20:05:43 +0200 [thread overview]
Message-ID: <1306778743.23844.5.camel@twins> (raw)
In-Reply-To: <20110530173916.GA1746@x4.trippels.de>
On Mon, 2011-05-30 at 19:39 +0200, Markus Trippelsdorf wrote:
> I get very high CPU values when I run 'top' on my (mostly) idle system
> with 3.0-rc1. For example mpd was always in the 1-2% range and is now
> constantly over 50%.
>
> This is caused by:
>
> commit 317f394160e9beb97d19a84c39b7e5eb3d7815a8
> Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
> Date: Tue Apr 5 17:23:58 2011 +0200
>
> sched: Move the second half of ttwu() to the remote cpu
>
> When I revert the above I see sane CPU values again.
So: echo NO_TTWU_QUEUE > /debug/sched_features, also cures it?
What architecture, what .config, and can you see it with anything other
than mpd (yum search mpd, only seems to result in mpd clients not the
actual server).
next prev parent reply other threads:[~2011-05-30 18:06 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-30 17:39 Very high CPU values in top on idle system (3.0-rc1) Markus Trippelsdorf
2011-05-30 18:05 ` Peter Zijlstra [this message]
2011-05-30 18:23 ` Markus Trippelsdorf
2011-05-30 20:45 ` Markus Trippelsdorf
2011-05-30 22:12 ` Peter Zijlstra
2011-05-31 9:55 ` Peter Zijlstra
2011-05-31 10:04 ` Markus Trippelsdorf
2011-05-31 12:31 ` [tip:sched/urgent] sched: Fix cross-cpu clock sync on remote wakeups tip-bot for Peter Zijlstra
2011-05-31 12:56 ` Borislav Petkov
2011-05-31 13:11 ` Peter Zijlstra
2011-06-01 7:05 ` Borislav Petkov
2011-06-01 10:36 ` Peter Zijlstra
2011-06-01 15:50 ` Borislav Petkov
2011-06-02 7:52 ` Yong Zhang
2011-06-02 13:04 ` Peter Zijlstra
2011-06-02 14:23 ` Yong Zhang
2011-06-02 15:48 ` Peter Zijlstra
2011-06-03 6:49 ` Yong Zhang
2011-06-03 9:57 ` Milton Miller
2011-06-03 10:36 ` Peter Zijlstra
2011-06-03 10:55 ` Peter Zijlstra
2011-06-03 10:58 ` Peter Zijlstra
2011-06-07 13:12 ` Borislav Petkov
2011-06-07 13:16 ` Peter Zijlstra
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=1306778743.23844.5.camel@twins \
--to=a.p.zijlstra@chello.nl \
--cc=linux-kernel@vger.kernel.org \
--cc=markus@trippelsdorf.de \
/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