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Message-Id: <20120804.012817.197969934709246517.davem@davemloft.net>
Date: Sat, 04 Aug 2012 01:28:17 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: eric.dumazet@...il.com
Cc: netdev@...r.kernel.org
Subject: Re: [PATCH net-next] ipv4: Introduce IN_DEV_NET_ROUTE_LOCALNET
From: Eric Dumazet <eric.dumazet@...il.com>
Date: Sat, 04 Aug 2012 09:27:25 +0200
> From: Eric Dumazet <edumazet@...gle.com>
>
> performance profiles show a high cost in the IN_DEV_ROUTE_LOCALNET()
> call done in ip_route_input_slow(), because of multiple dereferences,
> even if cache lines are clean and available in cpu caches.
>
> Since we already have the 'net' pointer, introduce
> IN_DEV_NET_ROUTE_LOCALNET() macro avoiding two dereferences
> (dev_net(in_dev->dev))
>
> Also change the tests to use IN_DEV_NET_ROUTE_LOCALNET() only if saddr
> or/and daddr are loopback addresse.
>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Applied.
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