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

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Message-ID: <4A91799D.7090802@gmail.com>
Date:	Sun, 23 Aug 2009 19:17:17 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	David Dillow <dave@...dillows.org>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Michael Riepe <michael.riepe@...glemail.com>,
	Michael Buesch <mb@...sch.de>,
	Francois Romieu <romieu@...zoreil.com>,
	Rui Santos <rsantos@...popie.com>,
	Michael Büker <m.bueker@...lin.de>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Michal Soltys <soltys@....info>
Subject: Re: [PATCH 2.6.30-rc4] r8169: avoid losing MSI interrupts

David Dillow wrote, On 08/22/2009 10:43 PM:

> On Sat, 2009-08-22 at 05:07 -0700, Eric W. Biederman wrote:
>> ebiederm@...ssion.com (Eric W. Biederman) writes:
>>
>>> David Dillow <dave@...dillows.org> writes:
>>>
>>>> Re-looking at the code, I'd guess that some IRQ status line is getting
>>>> stuck high, but I don't see why -- we should acknowledge all outstanding
>>>> interrupts each time through the loop, whether we care about them or
>>>> not.
>>>>
>>>> Could reproduce a problem with the following patch applied, and send the
>>>> full dmesg, please?
>>> Here is what I get.
>>>
>>> r8169 screaming irq status 00000085 mask 0000ffff event 0000803f napi 0000001d
>> And now that the machine has come out of it, that was followed by:
>> Looks like the soft lockup did not manage to trigger in this case.
> 
> I need some more context, please. What is the network load through this
> NIC when you have the issues? Light, heavy? Can you give me more details
> about the machine? A full dmesg from boot until this happens would help
> quite a bit. At a minimum it would help answer which version of the chip
> we're dealing with and what the machine it is in looks like.
> 
> Can you reproduce this with pci=nomsi? I'm assuming it the chip running
> in MSI mode.
> 
> Also, can you reproduce it when booting UP (or maxcpus=1)? I'm thinking
> about a race between rtl8169_interrupt() and rtl8169_poll(), but it
> isn't jumping out at me.
> 
> Also, I'm having connectivity troubles this weekend, so my response may
> be spotty. :(
> 


BTW, FYI, it seems Michal stopped tracking this problem, but he
found this commit problematic as well.

From: Michal Soltys <soltys@....info>
Subject: Re: r8169 (+others ?) and note_interrupt performance hit on 2.6.30.x
Date: Wed, 05 Aug 2009 20:54:47 +0200
http://marc.info/?l=linux-netdev&m=124949848110710&w=2

Jarek P.
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