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

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Message-Id: <85569979-6B4C-46D0-BDC8-B70785375D64@dominion.thruhere.net>
Date:	Wed, 13 Mar 2013 09:44:15 +0100
From:	Koen Kooi <koen@...inion.thruhere.net>
To:	Mark Jackson <mpfj-list@...c.co.uk>
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


Op 12 mrt. 2013, om 16:35 heeft Mark Jackson <mpfj-list@...c.co.uk> het volgende geschreven:

> 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)

You probably have PG2.x silicon, have a look at this patch: https://github.com/beagleboard/kernel/blob/3.8/patches/net/0003-cpsw-Fix-interrupt-storm-among-other-things.patch

I saw some patches going into net-next today that might address this in a different way, but I haven't tried 3.9rc on an am335x yet.--
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