From 1b6d427bb7eb69e6dc4f194a5b0f4a382a16ff82 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= Date: Thu, 9 Aug 2007 14:53:36 +0300 Subject: [TCP]: Reduce sacked_out with reno when purging write_queue MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Previously TCP had a transitional state during which reno counted segments that are already below the current window into sacked_out, which is now prevented. In addition, re-try now the unconditional S+L skb catching. This approach conservatively calls just remove_sack and leaves reset_sack() calls alone. The best solution to the whole problem would be to first calculate the new sacked_out fully (this patch does not move reno_sack_reset calls from original sites and thus does not implement this). However, that would require very invasive change to fastretrans_alert (perhaps even slicing it to two halves). Alternatively, all callers of tcp_packets_in_flight (i.e., users that depend on sacked_out) should be postponed until the new sacked_out has been calculated but it isn't any simpler alternative. Signed-off-by: Ilpo Järvinen Signed-off-by: David S. Miller --- include/net/tcp.h | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'include/net/tcp.h') diff --git a/include/net/tcp.h b/include/net/tcp.h index 7042c32085f..064c92fe00d 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -759,8 +759,7 @@ static inline __u32 tcp_current_ssthresh(const struct sock *sk) } /* Use define here intentionally to get BUG_ON location shown at the caller */ -#define tcp_verify_left_out(tp) \ - BUG_ON(tp->rx_opt.sack_ok && (tcp_left_out(tp) > tp->packets_out)) +#define tcp_verify_left_out(tp) BUG_ON(tcp_left_out(tp) > tp->packets_out) extern void tcp_enter_cwr(struct sock *sk, const int set_ssthresh); extern __u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst); -- cgit v1.2.3