1 files changed, 12 insertions, 6 deletions

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index d46338af6002..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
@@ -294,15 +300,15 @@ tcp_rmem - vector of 3 INTEGERs: min, default, max
         Default: 87380*2 bytes.
 
 tcp_mem - vector of 3 INTEGERs: min, pressure, max
-        low: below this number of pages TCP is not bothered about its
+        min: below this number of pages TCP is not bothered about its
         memory appetite.
 
         pressure: when amount of memory allocated by TCP exceeds this number
         of pages, TCP moderates its memory consumption and enters memory
         pressure mode, which is exited when memory consumption falls
-        under "low".
+        under "min".
 
-        high: number of pages allowed for queueing by all TCP sockets.
+        max: number of pages allowed for queueing by all TCP sockets.
 
         Defaults are calculated at boot time from amount of available
         memory.