From: Ingo Molnar The attached patch fixes long scheduling latencies caused by backlog triggered by __release_sock(). That code only executes in process context, and we've made the backlog queue private already at this point so it is safe to do a cond_resched_softirq(). This patch has been in the -VP patchset for some time. Signed-off-by: Ingo Molnar Signed-off-by: Andrew Morton --- 25-akpm/net/core/sock.c | 9 +++++++++ 1 files changed, 9 insertions(+) diff -puN net/core/sock.c~sched-net-fix-scheduling-latencies-in-__release_sock net/core/sock.c --- 25/net/core/sock.c~sched-net-fix-scheduling-latencies-in-__release_sock 2004-10-26 20:05:20.018146640 -0700 +++ 25-akpm/net/core/sock.c 2004-10-26 20:05:20.022146032 -0700 @@ -942,6 +942,15 @@ void __release_sock(struct sock *sk) skb->next = NULL; sk->sk_backlog_rcv(sk, skb); + + /* + * We are in process context here with softirqs + * disabled, use cond_resched_softirq() to preempt. + * This is safe to do because we've taken the backlog + * queue private: + */ + cond_resched_softirq(); + skb = next; } while (skb != NULL); _