netdev - Re: [PATCH net-next] inet: move ipv6only in sock

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Message-Id: <20140701.234636.65063413876214923.davem@davemloft.net>
Date:	Tue, 01 Jul 2014 23:46:36 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] inet: move ipv6only in sock_common

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 27 Jun 2014 08:36:16 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> When an UDP application switches from AF_INET to AF_INET6 sockets, we
> have a small performance degradation for IPv4 communications because of
> extra cache line misses to access ipv6only information.
> 
> This can also be noticed for TCP listeners, as ipv6_only_sock() is also
> used from __inet_lookup_listener()->compute_score()
> 
> This is magnified when SO_REUSEPORT is used.
> 
> Move ipv6only into struct sock_common so that it is available at
> no extra cost in lookups.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied, thanks Eric.
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