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Date: Wed, 11 Apr 2007 12:25:50 +0300 From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi> To: David Miller <davem@...emloft.net> Cc: netdev@...r.kernel.org Subject: [PATCH 1/2] [TCP] FRTO: Delay skb available check until it's mandatory No new data is needed until the first ACK comes, so no need to check for application limitedness until then. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi> --- net/ipv4/tcp_input.c | 21 ++++++++++++--------- 1 files changed, 12 insertions(+), 9 deletions(-) diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 107bece..21fd8fb 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -1312,20 +1312,15 @@ #endif return state.flag; } -/* F-RTO can only be used if these conditions are satisfied: - * - there must be some unsent new data - * - the advertised window should allow sending it - * - TCP has never retransmitted anything other than head (SACK enhanced - * variant from Appendix B of RFC4138 is more robust here) +/* F-RTO can only be used if TCP has never retransmitted anything other than + * head (SACK enhanced variant from Appendix B of RFC4138 is more robust here) */ int tcp_use_frto(struct sock *sk) { const struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb; - - if (!sysctl_tcp_frto || !tcp_send_head(sk) || - after(TCP_SKB_CB(tcp_send_head(sk))->end_seq, - tp->snd_una + tp->snd_wnd)) + + if (!sysctl_tcp_frto) return 0; if (IsSackFrto()) @@ -2849,6 +2844,14 @@ static int tcp_process_frto(struct sock } if (tp->frto_counter == 1) { + /* Sending of the next skb must be allowed or no FRTO */ + if (!tcp_send_head(sk) || + after(TCP_SKB_CB(tcp_send_head(sk))->end_seq, + tp->snd_una + tp->snd_wnd)) { + tcp_enter_frto_loss(sk, tp->frto_counter + 1, flag); + return 1; + } + tp->snd_cwnd = tcp_packets_in_flight(tp) + 2; tp->frto_counter = 2; return 1; -- 1.4.2 - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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