netdev - Re: [PATCH] gianfar: Fix crashes on RX path (Was Re: [Bugme-new] [Bug 19692] New: linux-2.6.36-rc5 crash with gianfar ethernet at full line rate traffic)

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Date:	Fri, 22 Oct 2010 08:14:08 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	emin ak <eminak71@...il.com>
Cc:	Jarek Poplawski <jarkao2@...il.com>,
	David Miller <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org,
	Anton Vorontsov <avorontsov@...sta.com>,
	Andy Fleming <afleming@...escale.com>
Subject: Re: [PATCH] gianfar: Fix crashes on RX path (Was Re: [Bugme-new]
 [Bug 19692] New: linux-2.6.36-rc5 crash with gianfar ethernet at full line
 rate traffic)

Le vendredi 22 octobre 2010 à 08:42 +0300, emin ak a écrit :
> Hi Jarek;
> 
> > Maybe for now let's try to get and see this type 1 again? Since the
> > recycle path is suspicious a bit to me, probably limiting memory or
> > slowing tx (maybe different mtus on eth0 and 1) under heavy multi cpu
> > load might help.
> >
> 
> I'll do my best with your recommended test conditions. I have reserved
> a machine and two ports of  hw packet generator, now we'll see if this
> error will occur again or not. (But I'am not sure if I want to see it
> again:)

Really this rx recycle affair is more than suspicious to me too.

Is it really worth the pain ?

Are MTU changes handled correctly ? ( must flush rx_recycle queue...)

Using a single rx_recycle queue in a supposed multiqueue driver makes
absolutely _no_ sense to me. This adds an artificial contention point.



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