netdev - Re: [PATCH net-next-2.6] ipv4: save cpu cycles from check

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Message-Id: <20110718.104203.518080599243849290.davem@davemloft.net>
Date:	Mon, 18 Jul 2011 10:42:03 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next-2.6] ipv4: save cpu cycles from check_leaf()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 18 Jul 2011 15:16:33 +0200

> [PATCH net-next-2.6] ipv4: save cpu cycles from check_leaf()
> 
> Compiler is not smart enough to avoid double BSWAP instructions in
> ntohl(inet_make_mask(plen)).
> 
> Lets cache this value in struct leaf_info, (fill a hole on 64bit arches)
> 
> With route cache disabled, this saves ~2% of cpu in udpflood bench on
> x86_64 machine.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied, thanks Eric.
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