linux-kernel - Re: ksoftirqd/n permanently eating 60% of a CPU

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Message-ID: <20100913075237.GA18081@apartia.fr>
Date:	Mon, 13 Sep 2010 09:52:37 +0200
From:	Louis-David Mitterrand <vindex+lists-linux-kernel@...rtia.org>
To:	linux-kernel@...r.kernel.org
Subject: Re: ksoftirqd/n permanently eating 60% of a CPU

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.
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