linux-kernel - Re: [PATCH] net: optimise inet_proto_csum

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Message-ID: <1411470654.26859.183.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 23 Sep 2014 04:10:54 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Christophe Leroy <christophe.leroy@....fr>
Cc:	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
	netdev@...r.kernel.org
Subject: Re: [PATCH] net: optimise inet_proto_csum_replace4()

On Tue, 2014-09-23 at 10:54 +0200, Christophe Leroy wrote:
> csum_partial() is a generic function which is not optimised for small fixed
> length calculations, and its use requires to store "from" and "to" values in
> memory while we already have them available in registers. This also has impact,
> especially on RISC processors. In the same spirit as the change done by
> Eric Dumazet on csum_replace2(), this patch rewrites inet_proto_csum_replace4()
> taking into account RFC1624.
> 
> I spotted during a NATted tcp transfert that csum_partial() is one of top 5
> consuming functions (around 8%), and the second user of csum_partial() is 
> inet_proto_csum_replace4().
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> 

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

Thanks !


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