netdev - Re: [PATCH 2.6.30-rc4] r8169: avoid losing MSI interrupts

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Message-ID: <20090524211557.GA14634@electric-eye.fr.zoreil.com>
Date:	Sun, 24 May 2009 23:15:57 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	David Dillow <dave@...dillows.org>
Cc:	Michael Riepe <michael.riepe@...glemail.com>,
	Michael Buesch <mb@...sch.de>,
	Rui Santos <rsantos@...popie.com>,
	Michael Büker <m.bueker@...lin.de>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 2.6.30-rc4] r8169: avoid losing MSI interrupts

David Dillow <dave@...dillows.org> :
[...]
> This fixes the lockups I've seen. Both MSI and level-triggered interrupt
> configurations survive over an hour of testing when it would lockup in
> under 90 seconds before. I am certain of the analysis of the root cause,
> but there may be better ways to fix it. There may also be a theoretical
> race window between the ending of a NAPI poll cycle and a link change
> interrupt coming in, but I'm not sure it would matter. 

It makes sense.

If I understand correctly, one should expect to find some pending Tx
event in the ISR of a failed card when reading the registers with
ethtool.

Has someone noticed it ?

-- 
Ueimor
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