diff options
Diffstat (limited to 'target/linux/generic/backport-4.9/024-3-tcp-tsq-add-shortcut-in-tcp_tasklet_func.patch')
-rw-r--r-- | target/linux/generic/backport-4.9/024-3-tcp-tsq-add-shortcut-in-tcp_tasklet_func.patch | 71 |
1 files changed, 0 insertions, 71 deletions
diff --git a/target/linux/generic/backport-4.9/024-3-tcp-tsq-add-shortcut-in-tcp_tasklet_func.patch b/target/linux/generic/backport-4.9/024-3-tcp-tsq-add-shortcut-in-tcp_tasklet_func.patch deleted file mode 100644 index b9b3c55076..0000000000 --- a/target/linux/generic/backport-4.9/024-3-tcp-tsq-add-shortcut-in-tcp_tasklet_func.patch +++ /dev/null @@ -1,71 +0,0 @@ -From b223feb9de2a65c533ff95c08e834fa732906ea5 Mon Sep 17 00:00:00 2001 -From: Eric Dumazet <edumazet@google.com> -Date: Sat, 3 Dec 2016 11:14:52 -0800 -Subject: [PATCH 03/10] tcp: tsq: add shortcut in tcp_tasklet_func() - -Under high stress, I've seen tcp_tasklet_func() consuming -~700 usec, handling ~150 tcp sockets. - -By setting TCP_TSQ_DEFERRED in tcp_wfree(), we give a chance -for other cpus/threads entering tcp_write_xmit() to grab it, -allowing tcp_tasklet_func() to skip sockets that already did -an xmit cycle. - -In the future, we might give to ACK processing an increased -budget to reduce even more tcp_tasklet_func() amount of work. - -Signed-off-by: Eric Dumazet <edumazet@google.com> -Signed-off-by: David S. Miller <davem@davemloft.net> ---- - net/ipv4/tcp_output.c | 22 ++++++++++++---------- - 1 file changed, 12 insertions(+), 10 deletions(-) - ---- a/net/ipv4/tcp_output.c -+++ b/net/ipv4/tcp_output.c -@@ -772,19 +772,19 @@ static void tcp_tasklet_func(unsigned lo - list_for_each_safe(q, n, &list) { - tp = list_entry(q, struct tcp_sock, tsq_node); - list_del(&tp->tsq_node); -+ clear_bit(TSQ_QUEUED, &tp->tsq_flags); - - sk = (struct sock *)tp; -- bh_lock_sock(sk); -- -- if (!sock_owned_by_user(sk)) { -- tcp_tsq_handler(sk); -- } else { -- /* defer the work to tcp_release_cb() */ -- set_bit(TCP_TSQ_DEFERRED, &tp->tsq_flags); -+ if (!sk->sk_lock.owned && -+ test_bit(TCP_TSQ_DEFERRED, &tp->tsq_flags)) { -+ bh_lock_sock(sk); -+ if (!sock_owned_by_user(sk)) { -+ clear_bit(TCP_TSQ_DEFERRED, &tp->tsq_flags); -+ tcp_tsq_handler(sk); -+ } -+ bh_unlock_sock(sk); - } -- bh_unlock_sock(sk); - -- clear_bit(TSQ_QUEUED, &tp->tsq_flags); - sk_free(sk); - } - } -@@ -889,7 +889,7 @@ void tcp_wfree(struct sk_buff *skb) - if (!(oval & TSQF_THROTTLED) || (oval & TSQF_QUEUED)) - goto out; - -- nval = (oval & ~TSQF_THROTTLED) | TSQF_QUEUED; -+ nval = (oval & ~TSQF_THROTTLED) | TSQF_QUEUED | TCPF_TSQ_DEFERRED; - nval = cmpxchg(&tp->tsq_flags, oval, nval); - if (nval != oval) - continue; -@@ -2222,6 +2222,8 @@ static bool tcp_write_xmit(struct sock * - unlikely(tso_fragment(sk, skb, limit, mss_now, gfp))) - break; - -+ if (test_bit(TCP_TSQ_DEFERRED, &tp->tsq_flags)) -+ clear_bit(TCP_TSQ_DEFERRED, &tp->tsq_flags); - if (tcp_small_queue_check(sk, skb, 0)) - break; - |