diff options
| author | Eric Dumazet <edumazet@google.com> | 2016-12-03 22:14:55 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-12-05 21:32:23 +0300 |
| commit | 12a59abc22d6664f7d3944f625ceefee92de8820 (patch) | |
| tree | 1a440d08ebc7f478066b858f5b071beaebe16e0c | |
| parent | 75eefc6c59fd2c5f1ab95a3a113c217237d12a31 (diff) | |
| download | linux-12a59abc22d6664f7d3944f625ceefee92de8820.tar.xz | |
tcp: tcp_mtu_probe() is likely to exit early
Adding a likely() in tcp_mtu_probe() moves its code which used to
be inlined in front of tcp_write_xmit()
We still have a cache line miss to access icsk->icsk_mtup.enabled,
we will probably have to reorganize fields to help data locality.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/tcp_output.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index d5c46749adab..5f04bee4c86a 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -1932,26 +1932,26 @@ static inline void tcp_mtu_check_reprobe(struct sock *sk) */ static int tcp_mtu_probe(struct sock *sk) { - struct tcp_sock *tp = tcp_sk(sk); struct inet_connection_sock *icsk = inet_csk(sk); + struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb, *nskb, *next; struct net *net = sock_net(sk); - int len; int probe_size; int size_needed; - int copy; + int copy, len; int mss_now; int interval; /* Not currently probing/verifying, * not in recovery, * have enough cwnd, and - * not SACKing (the variable headers throw things off) */ - if (!icsk->icsk_mtup.enabled || - icsk->icsk_mtup.probe_size || - inet_csk(sk)->icsk_ca_state != TCP_CA_Open || - tp->snd_cwnd < 11 || - tp->rx_opt.num_sacks || tp->rx_opt.dsack) + * not SACKing (the variable headers throw things off) + */ + if (likely(!icsk->icsk_mtup.enabled || + icsk->icsk_mtup.probe_size || + inet_csk(sk)->icsk_ca_state != TCP_CA_Open || + tp->snd_cwnd < 11 || + tp->rx_opt.num_sacks || tp->rx_opt.dsack)) return -1; /* Use binary search for probe_size between tcp_mss_base, |