Commit ebeef4bc authored Nov 27, 2018 by Eric Dumazet Committed by David S. Miller Nov 30, 2018

tcp: hint compiler about sack flows



Tell the compiler that most TCP flows are using SACK these days.

There is no need to add the unlikely() clause in tcp_is_reno(),
the compiler is able to infer it.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent b0e3f1bd

include/net/tcp.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -1124,7 +1124,7 @@ void tcp_rate_check_app_limited(struct sock *sk);
		*/
		static inline int tcp_is_sack(const struct tcp_sock *tp)
		{
		return tp->rx_opt.sack_ok;
		return likely(tp->rx_opt.sack_ok);
		}

		static inline bool tcp_is_reno(const struct tcp_sock *tp)