From: Frans Pop <elendil@planet.nl>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <peterz@infradead.org>,
linux-wireless@vger.kernel.org
Subject: [.32-rc3] scheduler: iwlagn consistently high in "waiting for CPU"
Date: Mon, 5 Oct 2009 15:00:54 +0200 [thread overview]
Message-ID: <200910051500.55875.elendil@planet.nl> (raw)
With .32-rc3 I'm getting occasional skips from amarok while playing music
from an NFS share (3 today so far), something I've not had in a long time.
The reason looks to be that latencytop consistently shows 'iwlagn' as the
top affected process with "Scheduler: waiting for CPU".
Values of 100-140 ms occur frequently, but I've also seen higher values
(180, 207). I don't remember seeing iwlagn high in the list before, but I
have not checked earlier kernels yet.
Added to that 'phy0' also frequently shows high with values of 25-75 ms.
The system is otherwise essentially idle. Other processes typically show a
latency < 5 ms.
System: HP 2510p notebook, x86_64, Core2 Duo, Debian stable
Cheers,
FJP
next reply other threads:[~2009-10-05 13:01 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-05 13:00 Frans Pop [this message]
2009-10-05 14:13 ` [.32-rc3] scheduler: iwlagn consistently high in "waiting for CPU" Frans Pop
2009-10-05 14:24 ` Arjan van de Ven
2009-10-06 15:49 ` Frans Pop
2009-10-07 17:10 ` Frans Pop
2009-10-07 18:10 ` Mike Galbraith
2009-10-07 18:34 ` Frans Pop
2009-10-08 4:05 ` Mike Galbraith
2009-10-08 6:23 ` Mike Galbraith
2009-10-08 13:40 ` Arjan van de Ven
2009-10-08 14:13 ` Mike Galbraith
2009-10-08 14:54 ` Mike Galbraith
2009-10-08 14:55 ` Frans Pop
2009-10-08 15:09 ` Arjan van de Ven
2009-10-08 18:23 ` Mike Galbraith
2009-10-08 20:34 ` Markus Trippelsdorf
2009-10-09 3:35 ` Mike Galbraith
2009-10-09 3:51 ` Markus Trippelsdorf
2009-10-08 20:59 ` Frans Pop
2009-10-09 3:04 ` Mike Galbraith
2009-10-09 6:35 ` Mike Galbraith
2009-10-09 7:13 ` Peter Zijlstra
2009-10-09 7:55 ` Sedat Dilek
2009-10-09 7:55 ` Sedat Dilek
2009-10-09 8:06 ` Peter Zijlstra
2009-10-09 8:06 ` Peter Zijlstra
2009-10-09 14:23 ` [tip:sched/urgent] sched: Update the clock of runqueue select_task_rq() selected tip-bot for Mike Galbraith
2009-10-09 16:27 ` [.32-rc3] scheduler: iwlagn consistently high in "waiting for CPU" Frans Pop
2009-10-09 20:06 ` Mike Galbraith
2009-10-08 15:30 ` [tip:timers/urgent] x86, timers: Check for pending timers after (device) interrupts tip-bot for Arjan van de Ven
2009-10-09 14:23 ` [tip:sched/urgent] Revert "x86, timers: Check for pending timers after (device) interrupts" tip-bot for Ingo Molnar
2009-10-08 11:24 ` [.32-rc3] scheduler: iwlagn consistently high in "waiting for CPU" Mike Galbraith
2009-10-08 13:09 ` Frans Pop
2009-10-08 13:18 ` Mike Galbraith
2009-10-08 13:45 ` Arjan van de Ven
2009-10-08 14:15 ` Mike Galbraith
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