netdev - Re: [PATCH 1/5] net: mvneta: increase the 64-bit rx/tx stats out of the hot path

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Message-ID: <1389574192.31367.194.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sun, 12 Jan 2014 16:49:52 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Willy Tarreau <w@....eu>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Subject: Re: [PATCH 1/5] net: mvneta: increase the 64-bit rx/tx stats out of
 the hot path

On Sun, 2014-01-12 at 10:31 +0100, Willy Tarreau wrote:
> Better count packets and bytes in the stack and on 32 bit then
> accumulate them at the end for once. This saves two memory writes
> and two memory barriers per packet. The incoming packet rate was
> increased by 4.7% on the Openblocks AX3 thanks to this.
> 
> Cc: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
> Cc: Gregory CLEMENT <gregory.clement@...e-electrons.com>
> Signed-off-by: Willy Tarreau <w@....eu>
> ---
>  drivers/net/ethernet/marvell/mvneta.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)


Reviewed-by: Eric Dumazet <edumazet@...gle.com>

Note that with such a cost, one has to wonder why we keep 64bit stats
for this NIC on 32bit hosts...


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