From b3a5b6cc7cab89dcc3301add750f88019d910a2b Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Thu, 24 Sep 2009 12:16:51 +0000 Subject: [PATCH] icmp: No need to call sk_write_space() 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 Signed-off-by: David S. Miller --- net/ipv4/icmp.c | 4 ++++ 1 file changed, 4 insertions(+) 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; } -- 2.7.4