[TCP]: Turn ABC off.

Turn Appropriate Byte Count off by default because it unfairly
penalizes applications that do small writes.  Add better documentation
to describe what it is so users will understand why they might want to
turn it on.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 10 insertions, 4 deletions

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 3e0c017e7877..90ed78110fd4 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -102,9 +102,15 @@ inet_peer_gc_maxtime - INTEGER
 TCP variables: 
 
 tcp_abc - INTEGER
-        Controls Appropriate Byte Count defined in RFC3465. If set to
-        0 then does congestion avoid once per ack. 1 is conservative
-        value, and 2 is more agressive.
+        Controls Appropriate Byte Count (ABC) defined in RFC3465.
+        ABC is a way of increasing congestion window (cwnd) more slowly
+        in response to partial acknowledgments.
+        Possible values are:
+                0 increase cwnd once per acknowledgment (no ABC)
+                1 increase cwnd once per acknowledgment of full sized segment
+                2 allow increase cwnd by two if acknowledgment is
+                  of two segments to compensate for delayed acknowledgments.
+        Default: 0 (off)
 
 tcp_syn_retries - INTEGER
         Number of times initial SYNs for an active TCP connection attempt
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 111ff39a08c5..159fa3f1ba67 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -89,7 +89,7 @@ int sysctl_tcp_frto;
 int sysctl_tcp_nometrics_save;
 
 int sysctl_tcp_moderate_rcvbuf = 1;
-int sysctl_tcp_abc = 1;
+int sysctl_tcp_abc;
 
 #define FLAG_DATA               0x01 /* Incoming frame contained data.          */
 #define FLAG_WIN_UPDATE         0x02 /* Incoming ACK was a window update.       */