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inet: move ipv6only in sock_common

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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@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2014-06-27 08:36:16 -07:00
committed by David S. Miller
parent 090cce4263
commit 9fe516ba3f
8 changed files with 18 additions and 18 deletions
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2
net/ipv4/tcp_minisocks.c
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@@ -298,7 +298,7 @@ void tcp_time_wait(struct sock *sk, int state, int timeo)
tw->tw_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
tw->tw_tclass = np->tclass;
tw->tw_flowlabel = np->flow_label >> 12;
tw->tw_ipv6only = np->ipv6only;
tw->tw_ipv6only = sk->sk_ipv6only;
}
#endif