netdev - Re: b44: regression in 2.6.22 (resend)

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Date:	Tue, 29 May 2007 20:28:19 +0200
From:	Maximilian Engelhardt <maxi@...monizer.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Michael Buesch <mb@...sch.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Jeff Garzik <jgarzik@...ox.com>,
	Gary Zambrano <zambrano@...adcom.com>, netdev@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: b44: regression in 2.6.22 (resend)

On Monday 28 May 2007, Thomas Gleixner wrote:
> On Mon, 2007-05-28 at 22:55 +0200, Maximilian Engelhardt wrote:
> > > > I additionally built my 2.6.22-rc2-mm1 kernel without High Resolution
> > > > Timer, but the high ping problem is still there.
> > >
> > > Hmm, that's mysterious. Wild guess is that highres exposes the hidden
> > > "feature" in a different way than rc2-mm1 does.
> >
> > I think the bug in 2.6.21/22-rc3 is a different one that the one in
> > 2.6.22-rc2-mm1, but that's also only a wild guess :)
> >
> > I'll explain this a bit:
> > In 2.6.21/22-rc3 is the same b44 driver that has been in the stock
> > kernels for some time. With this driver and High Resolution Timer turned
> > on I get problems using iperf. The problems are that the systems becomes
> > really slow and unresponsive.  Michael Buesch thought this could be an
> > IRQ storm which sounds logical to me. This bug did never happen to me
> > before I startet the iperf test.
>
> Can you please apply
>
> http://www.tglx.de/projects/hrtimers/2.6.22-rc3/patch-2.6.22-rc3-hrt1.patch
>
> on top of rc3 and check, whether it has any effect on your problem.
>
The patch didn't change anything.

> > The other issue happens only with 2.6.22-rc2-mm1 which includes the b44
> > ssb spilt. It's independed wether High Resolution Timer is turned on or
> > off I always get very varying and high ping times. The iperf-test doesn't
> > show the problems from 2.6.21/22-rc3.
>
> Neither with nor without highres ?

Yes, it doesn't matter if highres is turned on or off. iperf never showed the 
problem from 2.6.21/22-rc3.

Maxi

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