tcp: tcp_transmit_skb() optimizations
authorEric Dumazet <edumazet@google.com>
Thu, 10 Oct 2013 15:43:00 +0000 (08:43 -0700)
committerDavid S. Miller <davem@davemloft.net>
Fri, 11 Oct 2013 21:48:18 +0000 (17:48 -0400)
commitccdbb6e96beca362db876d820ac1e560ff6d9579
tree1ced2e6547f027d1417cb408142ce10c4f956754
parent29b67c39dc6e7ec4fdf78c620675de761971cd28
tcp: tcp_transmit_skb() optimizations

1) We need to take a timestamp only for skb that should be cloned.

Other skbs are not in write queue and no rtt estimation is done on them.

2) the unlikely() hint is wrong for receivers (they send pure ACK)

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: MF Nowlan <fitz@cs.yale.edu>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Acked-By: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/tcp_output.c