netdev - Re: [PATCH net-next-2.6] tg3: 64bits stats

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Message-Id: <1278351070.2087.70.camel@achroite.uk.solarflarecom.com>
Date:	Mon, 05 Jul 2010 18:31:10 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Matt Carlson <mcarlson@...adcom.com>,
	Michael Chan <mchan@...adcom.com>,
	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH net-next-2.6] tg3: 64bits stats

On Mon, 2010-07-05 at 18:03 +0200, Eric Dumazet wrote:
> Le lundi 05 juillet 2010 à 11:14 +0200, Eric Dumazet a écrit :
> > After commit be1f3c2c027c (net: Enable 64-bit net device statistics on
> > 32-bit architectures), we can now provide 64bit stats, even on 32bit
> > arches.
> > 
> > Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> > ---
> 
> Please disregard this patch.
> 
> There is small possibility a reader might read a 64bit value while
> another writer makes a change to it, changing high 32bit value.
> 
> A change in core network would be needed to make this 100% safe,
> possibly using a seqlock to protect dev->stats64

I really didn't want to add this overhead and complication to readers
when only some drivers need it.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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