diff options
| author | Paolo Abeni <pabeni@redhat.com> | 2023-09-12 19:10:03 +0200 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2023-09-12 19:10:04 +0200 |
| commit | 8fc8911b66962c6ff4345e7000930a4bcc54ae5a (patch) | |
| tree | 987f1ac9958a489af0b4bfd4726fb91ce94f028d /net/ipv4/tcp_input.c | |
| parent | cd8bae85815416d19f46e3828d457442f77de292 (diff) | |
| parent | 133c4c0d37175f510a10fa9bed51e223936073fc (diff) | |
Merge branch 'tcp-backlog-processing-optims'
Eric Dumazet says:
====================
tcp: backlog processing optims
First patches are mostly preparing the ground for the last one.
Last patch of the series implements sort of ACK reduction
only for the cases a TCP receiver is under high stress,
which happens for high throughput flows.
This gives us a ~20% increase of single TCP flow (100Gbit -> 120Gbit)
====================
Link: https://lore.kernel.org/r/20230911170531.828100-1-edumazet@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net/ipv4/tcp_input.c')
| -rw-r--r-- | net/ipv4/tcp_input.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 06fe1cf645d5a..41b471748437b 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -5553,6 +5553,14 @@ static void __tcp_ack_snd_check(struct sock *sk, int ofo_possible) tcp_in_quickack_mode(sk) || /* Protocol state mandates a one-time immediate ACK */ inet_csk(sk)->icsk_ack.pending & ICSK_ACK_NOW) { + /* If we are running from __release_sock() in user context, + * Defer the ack until tcp_release_cb(). + */ + if (sock_owned_by_user_nocheck(sk) && + READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_backlog_ack_defer)) { + set_bit(TCP_ACK_DEFERRED, &sk->sk_tsq_flags); + return; + } send_now: tcp_send_ack(sk); return; |