netdev - Re: 2.6.21-rc1: known regressions (v2) (part 2)

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Date:	Tue, 27 Feb 2007 09:33:49 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Adrian Bunk <bunk@...sta.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"David P. Reed" <dpreed@...d.com>,
	Ayaz Abdulla <aabdulla@...dia.com>, jgarzik@...ox.com,
	netdev@...r.kernel.org,
	Albert Hopkins <kernel@...duk.letterboxes.org>,
	Bob Tracy <rct@...rkin.frus.com>,
	Mark Brown <broonie@...ena.org.uk>,
	"Michael S. Tsirkin" <mst@...lanox.co.il>,
	Mike Galbraith <efault@....de>
Subject: Re: 2.6.21-rc1: known regressions (v2) (part 2)


* Michal Piotrowski <michal.k.k.piotrowski@...il.com> wrote:

> Thomas Gleixner napisał(a):
> > Adrian,
> > 
> > On Mon, 2007-02-26 at 23:05 +0100, Adrian Bunk wrote:
> >> Subject    : kernel BUG at kernel/time/tick-sched.c:168  (CONFIG_NO_HZ)
> >> References : http://lkml.org/lkml/2007/2/16/346
> >> Submitter  : Michal Piotrowski <michal.k.k.piotrowski@...il.com>
> >> Handled-By : Thomas Gleixner <tglx@...utronix.de>
> >> Status     : problem is being debugged
> > 
> > The BUG_ON() was replaced by a warning printk(). The BUG_ON() exposed a
> > problem with the SMT scheduler. See below.
> > 
> >> Subject    : BUG: soft lockup detected on CPU#0
> >>              NOHZ: local_softirq_pending 20  (SMT scheduler)
> >> References : http://lkml.org/lkml/2007/2/20/257
> >> Submitter  : Michal Piotrowski <michal.k.k.piotrowski@...il.com>
> >> Handled-By : Thomas Gleixner <tglx@...utronix.de>
> >>              Ingo Molnar <mingo@...e.hu>
> >> Status     : problem is being debugged
> > 
> > Patch available, not confirmed yet.
> > 
> 
> I can confirm that the bug is fixed (over 20 hours of testing should 
> be enough).

thanks alot! I think this thing was a long-term performance/latency 
regression in HT scheduling as well.

	Ingo
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