diff options
Diffstat (limited to 'target/linux/generic/backport-4.9/024-4-tcp-tsq-avoid-one-atomic-in-tcp_wfree.patch')
| -rw-r--r-- | target/linux/generic/backport-4.9/024-4-tcp-tsq-avoid-one-atomic-in-tcp_wfree.patch | 38 |
1 files changed, 0 insertions, 38 deletions
diff --git a/target/linux/generic/backport-4.9/024-4-tcp-tsq-avoid-one-atomic-in-tcp_wfree.patch b/target/linux/generic/backport-4.9/024-4-tcp-tsq-avoid-one-atomic-in-tcp_wfree.patch deleted file mode 100644 index 87452ac853..0000000000 --- a/target/linux/generic/backport-4.9/024-4-tcp-tsq-avoid-one-atomic-in-tcp_wfree.patch +++ /dev/null @@ -1,38 +0,0 @@ -From a9b204d1564702b704ad6fe74f10a102c7b87ba3 Mon Sep 17 00:00:00 2001 -From: Eric Dumazet <edumazet@google.com> -Date: Sat, 3 Dec 2016 11:14:53 -0800 -Subject: [PATCH 04/10] tcp: tsq: avoid one atomic in tcp_wfree() - -Under high load, tcp_wfree() has an atomic operation trying -to schedule a tasklet over and over. - -We can schedule it only if our per cpu list was empty. - -Signed-off-by: Eric Dumazet <edumazet@google.com> -Signed-off-by: David S. Miller <davem@davemloft.net> ---- - net/ipv4/tcp_output.c | 5 ++++- - 1 file changed, 4 insertions(+), 1 deletion(-) - ---- a/net/ipv4/tcp_output.c -+++ b/net/ipv4/tcp_output.c -@@ -885,6 +885,7 @@ void tcp_wfree(struct sk_buff *skb) - - for (oval = READ_ONCE(tp->tsq_flags);; oval = nval) { - struct tsq_tasklet *tsq; -+ bool empty; - - if (!(oval & TSQF_THROTTLED) || (oval & TSQF_QUEUED)) - goto out; -@@ -897,8 +898,10 @@ void tcp_wfree(struct sk_buff *skb) - /* queue this socket to tasklet queue */ - local_irq_save(flags); - tsq = this_cpu_ptr(&tsq_tasklet); -+ empty = list_empty(&tsq->head); - list_add(&tp->tsq_node, &tsq->head); -- tasklet_schedule(&tsq->tasklet); -+ if (empty) -+ tasklet_schedule(&tsq->tasklet); - local_irq_restore(flags); - return; - } |