From: Louis-David Mitterrand <vindex+lists-linux-kernel@apartia.org>
To: linux-kernel@vger.kernel.org
Subject: Re: ksoftirqd/n permanently eating 60% of a CPU
Date: Mon, 13 Sep 2010 09:52:37 +0200 [thread overview]
Message-ID: <20100913075237.GA18081@apartia.fr> (raw)
In-Reply-To: <20100912185715.GA8775@rhlx01.hs-esslingen.de>
On Sun, Sep 12, 2010 at 08:57:15PM +0200, Andreas Mohr wrote:
> > Examining /proc/interrupts shows that "Local timer interrupts" are
> > mainly firing.
>
> > Strangely enough, the interrupt storm starts only 5 minutes or so after
> > bootup.
>
> And have you tried running powertop or manually (perhaps via
> sophisticated shell script) keeping a watch on
> /proc/timer[list|stats]?
Hi,
powertop seems to give a strong hint:
54.5% (250.2) [kernel core] dsp_cmx_send (dsp_cmx_send)
25.8% (118.6) usbhid-ups
5.8% ( 26.7) [ahci] <interrupt>
2.6% ( 12.0) [kernel core] usb_hcd_poll_rh_status (rh_timer_func)
Apparently dsp_cmx_send is in the mISDN stack which, in my kernel, is
compiled statically. This happens regardless of the box having isdn
hardware.
next prev parent reply other threads:[~2010-09-13 7:54 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-05 17:39 ksoftirqd/n permanently eating 60% of a CPU Louis-David Mitterrand
2010-09-12 10:31 ` Andreas Mohr
2010-09-12 15:41 ` Louis-David Mitterrand
2010-09-12 18:57 ` Andreas Mohr
2010-09-13 7:52 ` Louis-David Mitterrand [this message]
2010-09-13 10:09 ` Louis-David Mitterrand
2010-09-12 19:09 ` Andreas Mohr
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