diff options
| author |   Eric Dumazet <edumazet@google.com> | 2017-10-05 22:21:24 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-10-07 00:28:53 +0100 |
| commit | 5e76ee4b8e90384936a214cde5b7816424f70232 (patch) | |
| tree | 24d8072eb5d33600fd67ab24ffa4f3706ee390d8 /net | |
| parent | tcp: tcp_tx_timestamp() cleanup (diff) | |
| download | linux-dev-5e76ee4b8e90384936a214cde5b7816424f70232.tar.xz linux-dev-5e76ee4b8e90384936a214cde5b7816424f70232.zip | |
tcp: tcp_mark_head_lost() optimization
It will be a bit more expensive to get the head of rtx queue
once rtx queue is converted to an rb-tree.
We can avoid this extra cost in case tp->lost_skb_hint is set.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp_input.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 90afe4143596..abc3b1db81f8 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -2207,12 +2207,12 @@ static void tcp_mark_head_lost(struct sock *sk, int packets, int mark_head) const u32 loss_high = tcp_is_sack(tp) ? tp->snd_nxt : tp->high_seq; WARN_ON(packets > tp->packets_out); - if (tp->lost_skb_hint) { - skb = tp->lost_skb_hint; - cnt = tp->lost_cnt_hint; + skb = tp->lost_skb_hint; + if (skb) { /* Head already handled? */ - if (mark_head && skb != tcp_write_queue_head(sk)) + if (mark_head && after(TCP_SKB_CB(skb)->seq, tp->snd_una)) return; + cnt = tp->lost_cnt_hint; } else { skb = tcp_write_queue_head(sk); cnt = 0; |