linux-kernel - Re: [Bugme-new] [Bug 8100] New: dynticks makes ksoftirqd1 use unreasonable amount of cpu time

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Message-Id: <20070228140023.46bbba98.akpm@linux-foundation.org>
Date:	Wed, 28 Feb 2007 14:00:23 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"bugme-daemon@...nel-bugs.osdl.org" 
	<bugme-daemon@...zilla.kernel.org>, jkarlson@...hut.fi
Subject: Re: [Bugme-new] [Bug 8100] New: dynticks makes ksoftirqd1 use
 unreasonable amount of cpu time

On Wed, 28 Feb 2007 09:34:10 -0800
bugme-daemon@...zilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=8100
> 
>            Summary: dynticks makes ksoftirqd1 use unreasonable amount of cpu
>                     time
>     Kernel Version: 2.6.21-rc2
>             Status: NEW
>           Severity: low
>              Owner: johnstul@...ibm.com
>          Submitter: jkarlson@...hut.fi
> 
> 
> Most recent kernel where this bug did *NOT* occur:
> any kernel without dynticks
> 
> Distribution:
> Debian etch with linux-2.6.21-rc{2,1}
> 
> Hardware Environment: 
> Macbook core2 with bios emulation
> 
> Software Environment:
> The problem is obvious when listening to shoutcast stream with kmplayer and 
> artsd via wi-fi with  wpa (wpa_supplicant)
> 
> Problem Description:
> ksoftirqd1 uses ~30% cpu-time (by top) no other symptoms, while
> without dyntikcs cpu-load in similar circumstances is negligible.
> This might be a dynticks feature rather than bug.
> 
> Steps to reproduce:
> Just watch the top, if the bug is reproducible, probably just booting should 
> suffice.
> 
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