Messages in this thread | | | Date | Fri, 26 Sep 2014 16:14:36 -0400 (EDT) | Subject | Re: [PATCH] net: optimise csum_replace4() | From | David Miller <> |
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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.
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