linux-kernel - Re: Excessive ethernet interrupts on AM335x board

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Message-ID: <514056CB.6070808@mimc.co.uk>
Date:	Wed, 13 Mar 2013 10:36:59 +0000
From:	Mark Jackson <mpfj-list@...c.co.uk>
To:	Daniel Mack <zonque@...il.com>
CC:	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: Excessive ethernet interrupts on AM335x board

On 13/03/13 10:32, Daniel Mack wrote:
> On Tue, Mar 12, 2013 at 4:35 PM, Mark Jackson <mpfj-list@...c.co.uk> wrote:
>> I'm just fighting an issue with ethernet on our custom AM335x board:-
>>
>> # uname -a
>> Linux nanobone 3.9.0-rc2-00113-gd60f039 #139 Tue Mar 12 15:14:01 GMT 2013 armv7l GNU/Linux
>>
>> Every now and then, the whole unit slows to a crawl.  The only indication of any problem is:-
>>
>> (a) the serial tty port becomes much less responsive
>> (b) normal ping times jump from 1ms to >10sec (sometimes >20sec !!)
>> (c) the ethernet interrupt count rockets (see below)
>>
>> I've tried to force the problem by flood pinging from my PC.

<snip>

>> As you can see, when I stop the flood pings, the nfs link is now reported
>> as being lost.
> 
> I had the same problem. Please check this patch, I'm sure it will fix you issue:
> 
>   https://git.kernel.org/cgit/linux/kernel/git/davem/net.git/commit/?id=d35162f89b8f00537d7b240b76d2d0e8b8d29aa0

Brilliant ... that's the one !!  

Cheers
Mark J.
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