netdev - Re: [PATCH net-next-2.6 1/3] be2net: fix netdev_stats

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Message-ID: <20110627094337.5108b5f6@nehalam.ftrdhcpuser.net>
Date:	Mon, 27 Jun 2011 09:43:37 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Sathya Perla <sathya.perla@...lex.com>
Cc:	<netdev@...r.kernel.org>
Subject: Re: [PATCH net-next-2.6 1/3] be2net: fix netdev_stats_update

On Mon, 27 Jun 2011 12:10:48 +0530
Sathya Perla <sathya.perla@...lex.com> wrote:

> Problem initially reproted and fixed by Eric Dumazet <eric.dumazet@...il.com>
> 
> netdev_stats_update() resets netdev->stats and then accumulates stats from
> various rings. This is wrong as stats readers can sometimes catch zero values.
> Use temporary variables instead for accumulating per-ring values.
> 
> Signed-off-by: Sathya Perla <sathya.perla@...lex.com>

Should also use u64_stats_sync to ensure correct rollover or 32 bit SMP
platform.
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