linux-kernel - Re: b44: regression in 2.6.22 (resend)

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Date:	Sun, 3 Jun 2007 18:26:02 +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 19:44 +0200, Maximilian Engelhardt wrote:
> > > Can you please keep CONFIG_HIGH_RES_TIMERS and CONFIG_NOHZ and try the
> > > following combinations on the kernel command line:
> > >
> > > 1) highres=off nohz=off (should be the same as your working config)
> > > 2) highres=off
> > > 3) nohz=off
> >
> > I tested this with my 2.6.22-rc3 kernel, here are the results:
> >
> > without any special boot parameters: problem does appear
> > highres=off nohz=off: problem does not appear
> > highres=off: problem does not appear
> > nohz=off: problem does appear
>
> Is there any other strange behavior of the high res enabled kernel than
> the b44 problem ?

I didn't notice anything in the past (as I wrote). But today I did some tests 
for an updated version of the p54 mac80211 wlan driver and I noticed exactly 
the same problem:

when booting with highres=off everything is fine.
But when I boot an highres enabled kernel and I do the iperf-test with the p54 
driver, my systems becomes unresponsive during the test. It seems to be 
exactly the same problem I have with the b44 driver.
So this might not be a bug in the b44 code but a bug somewhere in the linux 
networking code.

I did the test with an 2.6.22-rc3-git4 kernel and the p54 driver built 
external as module. 

Maxi

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