| Message ID | 4ABBEFD3.6060407@gmail.com |
|---|---|
| State | Accepted, archived |
| Delegated to: | David Miller |
| Headers | show |
From: Eric Dumazet <eric.dumazet@gmail.com> Date: Fri, 25 Sep 2009 00:16:51 +0200 > We can make icmp messages tx completion callback a litle bit faster. > > Setting SOCK_USE_WRITE_QUEUE sk flag tells sock_wfree() to > not call sk_write_space() on a socket we know no thread is posssibly > waiting for write space. (on per cpu kernel internal icmp sockets only) > > This avoids the sock_def_write_space() call and > read_lock(&sk->sk_callback_lock)/read_unlock(&sk->sk_callback_lock) calls > as well. > > We avoid three atomic ops. > > Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Applied to net-next-2.6 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index 5bc13fe..84adb57 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -1165,6 +1165,10 @@ static int __net_init icmp_sk_init(struct net *net) sk->sk_sndbuf = (2 * ((64 * 1024) + sizeof(struct sk_buff))); + /* + * Speedup sock_wfree() + */ + sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); inet_sk(sk)->pmtudisc = IP_PMTUDISC_DONT; }
We can make icmp messages tx completion callback a litle bit faster. Setting SOCK_USE_WRITE_QUEUE sk flag tells sock_wfree() to not call sk_write_space() on a socket we know no thread is posssibly waiting for write space. (on per cpu kernel internal icmp sockets only) This avoids the sock_def_write_space() call and read_lock(&sk->sk_callback_lock)/read_unlock(&sk->sk_callback_lock) calls as well. We avoid three atomic ops. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> --- -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html