[TCP]: Turn ABC off.

[linux-2.6-omap-h63xx.git] / Documentation / networking / ip-sysctl.txt

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 3e0c017e78772aba2857aca4d78ac24364a1e15d..90ed78110fd49fde8b3a8ad237730e76afb55ab2 100644 (file)
--- 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