From: Mike Galbraith <efault@gmx.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Damien Wyart <damien.wyart@free.fr>, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org,
paulmck <paulmck@linux.vnet.ibm.com>
Subject: Re: Very high CPU load when idle with 3.0-rc1
Date: Mon, 30 May 2011 15:10:43 +0200 [thread overview]
Message-ID: <1306761043.7415.5.camel@marge.simson.net> (raw)
In-Reply-To: <1306755291.1200.2872.camel@twins>
On Mon, 2011-05-30 at 13:34 +0200, Peter Zijlstra wrote:
> On Mon, 2011-05-30 at 07:59 +0200, Damien Wyart wrote:
> > Hi,
> >
> > Testing 3.0-rc1 on a core i7 (4 cores + HT), I get a load average of 9.0
> > when idle. No process is shown running or in "D state" in htop. The box
> > is behaving normal, no impression of lag or slowness.
> >
> > Not sure what other info to include, I guess this should be quite easy
> > to reproduce.
>
>
> ---
> Subject: rcu: Cure load woes
>
> Commit cc3ce5176d83 (rcu: Start RCU kthreads in TASK_INTERRUPTIBLE
> state) fudges a sleeping task' state, resulting in the scheduler seeing
> a TASK_UNINTERRUPTIBLE task going to sleep, but a TASK_INTERRUPTIBLE
> task waking up. The result is unbalanced load calculation.
(darn, 'which' poked me in the eye, but 'how' didn't)
Yup, all better.
-Mike
next prev parent reply other threads:[~2011-05-30 13:10 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-30 5:59 Very high CPU load when idle with 3.0-rc1 Damien Wyart
2011-05-30 11:34 ` Peter Zijlstra
2011-05-30 12:17 ` Ingo Molnar
2011-05-30 13:10 ` Mike Galbraith [this message]
2011-05-30 16:23 ` Paul E. McKenney
2011-05-30 16:41 ` Paul E. McKenney
2011-05-30 16:47 ` Peter Zijlstra
2011-05-30 16:46 ` Peter Zijlstra
2011-05-30 21:29 ` Paul E. McKenney
2011-05-30 21:35 ` Peter Zijlstra
2011-05-31 1:45 ` Paul E. McKenney
2011-05-30 17:19 ` Peter Zijlstra
2011-05-30 21:28 ` Paul E. McKenney
2011-05-30 21:33 ` Peter Zijlstra
2011-05-31 1:45 ` Paul E. McKenney
2011-06-01 11:05 ` Peter Zijlstra
2011-06-01 14:37 ` Paul E. McKenney
2011-06-01 16:58 ` Peter Zijlstra
2011-06-01 18:19 ` Paul E. McKenney
2011-05-31 12:30 ` [tip:core/urgent] rcu: Cure load woes tip-bot for Peter Zijlstra
2011-05-30 11:50 ` Very high CPU load when idle with 3.0-rc1 Damien Wyart
2011-05-30 12:22 ` Morten P.D. Stevens
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