tcp: Adjust SYN retransmit backoff a little bit.

This pattern is proposed by:
  Chu, J., "Tuning TCP Parameters for the 21st Century",
  http://www.ietf.org/proceedings/75/slides/tcpm-1.pdf

diff --git a/sys/netinet/tcp_timer.c b/sys/netinet/tcp_timer.c
index ecdb89b..b658907 100644 (file)
--- a/sys/netinet/tcp_timer.c
+++ b/sys/netinet/tcp_timer.c
@@ -226,7 +226,7 @@ int tcp_syn_backoff[TCP_MAXRXTSHIFT + 1] =
     { 1, 1, 1, 1, 1, 2, 4, 8, 16, 32, 64, 64, 64 };
 
 int    tcp_syn_backoff_low[TCP_MAXRXTSHIFT + 1] =
-    { 1, 2, 4, 4, 4, 8, 16, 16, 32, 64, 64, 64, 64 };
+    { 1, 1, 2, 4, 8, 8, 16, 16, 32, 64, 64, 64, 64 };
 
 int    tcp_backoff[TCP_MAXRXTSHIFT + 1] =
     { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };