lkml.org 
[lkml]   [2014]   [Sep]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH] net: optimise csum_replace4()
From
From: Christophe Leroy <christophe.leroy@c-s.fr>
Date: Tue, 23 Sep 2014 10:54:32 +0200 (CEST)

> 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().
>
> I have proposed the same modification to inet_proto_csum_replace4() in another
> patch.
>
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>

Applied.


\
 
 \ /
  Last update: 2014-09-26 22:41    [W:0.046 / U:0.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site