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

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Message-ID: <20070309212334.GA6447@ucw.cz>
Date:	Fri, 9 Mar 2007 21:23:34 +0000
From:	Pavel Machek <pavel@....cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, 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

Hi!

> 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.

top lies. top has always lied, now it lies more. Do not trust top.
RESOLVED/INVALID?

							Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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