Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=9ead9a1d385ae2c52a6dcf2828d84ce66be04fc2
Commit: 9ead9a1d385ae2c52a6dcf2828d84ce66be04fc2
Parent: 522e7548a9bd40305df41c0beae69448b7620d6b
Author: Ilpo Järvinen <[EMAIL PROTECTED]>
AuthorDate: Wed Feb 21 22:56:19 2007 -0800
Committer: David S. Miller <[EMAIL PROTECTED]>
CommitDate: Wed Apr 25 22:23:01 2007 -0700
[TCP] FRTO: Separated response from FRTO detection algorithm
FRTO spurious RTO detection algorithm (RFC4138) does not include response
to a detected spurious RTO but can use different response algorithms.
Signed-off-by: Ilpo Järvinen <[EMAIL PROTECTED]>
Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
---
net/ipv4/tcp_input.c | 16 ++++++++++------
1 files changed, 10 insertions(+), 6 deletions(-)
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index b21e232..c5be3d0 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2467,6 +2467,15 @@ static int tcp_ack_update_window(struct sock *sk, struct
tcp_sock *tp,
return flag;
}
+/* A very conservative spurious RTO response algorithm: reduce cwnd and
+ * continue in congestion avoidance.
+ */
+static void tcp_conservative_spur_to_response(struct tcp_sock *tp)
+{
+ tp->snd_cwnd = min(tp->snd_cwnd, tp->snd_ssthresh);
+ tcp_moderate_cwnd(tp);
+}
+
static void tcp_process_frto(struct sock *sk, u32 prior_snd_una)
{
struct tcp_sock *tp = tcp_sk(sk);
@@ -2488,12 +2497,7 @@ static void tcp_process_frto(struct sock *sk, u32
prior_snd_una)
*/
tp->snd_cwnd = tcp_packets_in_flight(tp) + 2;
} else {
- /* Also the second ACK after RTO advances the window.
- * The RTO was likely spurious. Reduce cwnd and continue
- * in congestion avoidance
- */
- tp->snd_cwnd = min(tp->snd_cwnd, tp->snd_ssthresh);
- tcp_moderate_cwnd(tp);
+ tcp_conservative_spur_to_response(tp);
}
/* F-RTO affects on two new ACKs following RTO.
-
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