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tcp: don't clear retransmit_skb_hint when not necessary

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Most importantly avoid doing it with cumulative ACK. Not clearing
means that we no longer need n^2 processing in resolution of each
fast recovery.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilpo Järvinen
2008-09-20 21:25:15 -07:00
committed by David S. Miller
parent f0ceb0ed86
commit ef9da47c7c
3 changed files with 14 additions and 5 deletions
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4
net/ipv4/tcp_input.c
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@@ -2925,7 +2925,9 @@ static int tcp_clean_rtx_queue(struct sock *sk, int prior_fackets)
tcp_unlink_write_queue(skb, sk);
sk_wmem_free_skb(sk, skb);
tcp_clear_all_retrans_hints(tp);
tcp_clear_retrans_hints_partial(tp);
if (skb == tp->retransmit_skb_hint)
tp->retransmit_skb_hint = NULL;
}
if (skb && (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED))