From: Paolo Abeni <pab...@redhat.com> Date: Thu, 30 Mar 2017 14:03:06 +0200
> 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 <pab...@redhat.com> Applied, thanks.
