Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=575ee7140dabe9b9c4f66f4f867039b97e548867
Commit:     575ee7140dabe9b9c4f66f4f867039b97e548867
Parent:     157bfc25020f7eb731f94140e099307ade47299e
Author:     Ilpo Järvinen <[EMAIL PROTECTED]>
AuthorDate: Mon Apr 30 00:39:55 2007 -0700
Committer:  David S. Miller <[EMAIL PROTECTED]>
CommitDate: Mon Apr 30 00:58:12 2007 -0700

    [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 <[EMAIL PROTECTED]>
    Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
---
 net/ipv4/tcp_input.c |   19 +++++++++++--------
 1 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 051f0f8..6b66989 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1265,20 +1265,15 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff 
*ack_skb, u32 prior_snd_
        return 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())
@@ -2710,6 +2705,14 @@ static int tcp_process_frto(struct sock *sk, u32 
prior_snd_una, int flag)
        }
 
        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;
-
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