netdev - Re: [PATCH][net-next] gianfar: Simplify MQ polling to avoid soft lockup

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Message-Id: <20131018.155509.1014087515327657926.davem@davemloft.net>
Date:	Fri, 18 Oct 2013 15:55:09 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	claudiu.manoil@...escale.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH][net-next] gianfar: Simplify MQ polling to avoid soft
 lockup

From: Claudiu Manoil <claudiu.manoil@...escale.com>
Date: Mon, 14 Oct 2013 17:05:09 +0300

> Under certain low traffic conditions, the single core
> devices with multiple Rx/Tx queues (MQ mode) may reach
> soft lockup due to gfar_poll not returning in proper time.
> The following exception was obtained using iperf on a 100Mbit
> half-duplex link, for a p1010 single core device:
 ...
> To prevent this, the outer while() loop has been removed
> allowing gfar_poll() to return faster even if there's
> still budget left.  Also, there's no need to recompute
> the budget per Rx queue anymore.
> 
> Signed-off-by: Claudiu Manoil <claudiu.manoil@...escale.com>

Applied, thanks.
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