From: Thomas Graf <tgraf@redhat.com>
Date: Fri, 23 Jul 2010 15:32:31 -0400
Subject: [net] tcp: set Cubic and BIC default thresholds to zero
Message-id: <20100723153231.GF14925@lsx.localdomain>
Patchwork-id: 27064
O-Subject: [RHEL5.6 PATCH 4/14] tcp: Set initial_ssthresh default to zero in
	Cubic and BIC.
Bugzilla: 612709
RH-Acked-by: Neil Horman <nhorman@redhat.com>
RH-Acked-by: David S. Miller <davem@redhat.com>

commit 66e1e3b20cbbf99da63e6c1af0fc6d39c2ed099a
Author: David S. Miller <davem@sunset.davemloft.net>
Date:   Wed Jun 13 01:03:53 2007 -0700

    [TCP]: Set initial_ssthresh default to zero in Cubic and BIC.

    Because of the current default of 100, Cubic and BIC perform very
    poorly compared to standard Reno.

    In the worst case, this change makes Cubic and BIC as aggressive as
    Reno.  So this change should be very safe.

    Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Jarod Wilson <jarod@redhat.com>

diff --git a/net/ipv4/tcp_bic.c b/net/ipv4/tcp_bic.c
index b0134ab..3be84b1 100644
--- a/net/ipv4/tcp_bic.c
+++ b/net/ipv4/tcp_bic.c
@@ -29,7 +29,7 @@ static int fast_convergence = 1;
 static int max_increment = 16;
 static int low_window = 14;
 static int beta = 819;		/* = 819/1024 (BICTCP_BETA_SCALE) */
-static int initial_ssthresh = 100;
+static int initial_ssthresh;
 static int smooth_part = 20;
 
 module_param(fast_convergence, int, 0644);
diff --git a/net/ipv4/tcp_cubic.c b/net/ipv4/tcp_cubic.c
index c3b01b5..7ae00ae 100644
--- a/net/ipv4/tcp_cubic.c
+++ b/net/ipv4/tcp_cubic.c
@@ -29,7 +29,7 @@
 static int fast_convergence = 1;
 static int max_increment = 16;
 static int beta = 819;		/* = 819/1024 (BICTCP_BETA_SCALE) */
-static int initial_ssthresh = 100;
+static int initial_ssthresh;
 static int bic_scale = 41;
 static int tcp_friendliness = 1;