netdev - Re: 2.6.20->2.6.21 - networking dies after random time

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Message-ID: <20070807082321.GB2120@ff.dom.local>
Date:	Tue, 7 Aug 2007 10:23:21 +0200
From:	Jarek Poplawski <jarkao2@...pl>
To:	Marcin Ślusarz <marcin.slusarz@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jean-Baptiste Vignaud <vignaud@...dmail.fr>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	shemminger <shemminger@...ux-foundation.org>,
	linux-net <linux-net@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: 2.6.20->2.6.21 - networking dies after random time

On Tue, Aug 07, 2007 at 09:46:36AM +0200, Marcin Ślusarz wrote:
> 2007/8/6, Ingo Molnar <mingo@...e.hu>:
> > (..)
> > please try Jarek's second patch too - there was a missing unmask.
> >
> >         Ingo
> >
> > -------------->
> > Subject: genirq: fix simple and fasteoi irq handlers
> > From: Jarek Poplawski <jarkao2@...pl>
...
> Network card still locks up (tested on 2.6.22.1). I had to upload more
> data than usual (~350 MB vs ~1-100 MB) to trigger that bug but it
> might be a coincidence...

Thanks! It's a good news after all - it would be really strange why
this place doesn't hit more people (it seems there is some safety
elsewhere for this).

BTW: I hope, this previous Thomas' patch with Ingo's warning to resend.c
(with a warning), had no problems with a similar load?

So, once more, I would suspect hw retrigger code. Ingo, IMHO, this
patch for testing HARDIRQS_SW_RESEND could be reworked, so that
desc->chip->retrigger() is done only for eadges and the tasklet only
for levels. BTW, I think this current warning in the "temporary" is
is too early - we don't know if after this the ->retrigger() will
take place.

Regards,
Jarek P.

PS: Marcin, if you need a break in this testing let us know!
I think the main idea of this bug is known enough.
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