diff options
| author | Paolo Abeni <pabeni@redhat.com> | 2017-03-30 15:03:06 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-03-31 06:05:24 +0300 |
| commit | 6c7c98bad4883a4a8710c96b2b44de482865eb6e (patch) | |
| tree | 0995daa9a97afde4b675dea6054701d04404a3ac /net | |
| parent | 7801a3225e7fe05f7601ab42a5669ba633c4df54 (diff) | |
| download | linux-6c7c98bad4883a4a8710c96b2b44de482865eb6e.tar.xz | |
sock: avoid dirtying sk_stamp, if possible
sock_recv_ts_and_drops() unconditionally set sk->sk_stamp for
every packet, even if the SOCK_TIMESTAMP flag is not set in the
related socket.
If selinux is enabled, this cause a cache miss for every packet
since sk->sk_stamp and sk->sk_security share the same cacheline.
With this change sk_stamp is set only if the SOCK_TIMESTAMP
flag is set, and is cleared for the first packet, so that the user
perceived behavior is unchanged.
This gives up to 5% speed-up under udp-flood with small packets.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/sock.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/sock.c b/net/core/sock.c index 1a58a9dc6888..392f9b6f96e2 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -2613,7 +2613,7 @@ void sock_init_data(struct socket *sock, struct sock *sk) sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; - sk->sk_stamp = ktime_set(-1L, 0); + sk->sk_stamp = SK_DEFAULT_STAMP; #ifdef CONFIG_NET_RX_BUSY_POLL sk->sk_napi_id = 0; |