ipvs: Document sysctl sync_qlen_max and sync_sock_size

Document sysctl sync_qlen_max and sync_sock_size based on
commit 1c003b1580e2 ("ipvs: wakeup master thread").

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

diff --git a/Documentation/networking/ipvs-sysctl.txt b/Documentation/networking/ipvs-sysctl.txt
index 7acaaa65451e717b5f008525513b55974083ea46..159d70b6dff3dcd6761dada9af312af6a12415f1 100644 (file)
--- a/Documentation/networking/ipvs-sysctl.txt
+++ b/Documentation/networking/ipvs-sysctl.txt
@@ -217,6 +217,20 @@ sync_retries - INTEGER
        to protect against loss of sync messages. The range of the
        sync_retries is from 0 to 3.
 
+sync_qlen_max - UNSIGNED LONG
+
+       Hard limit for queued sync messages that are not sent yet. It
+       defaults to 1/32 of the memory pages but actually represents
+       number of messages. It will protect us from allocating large
+       parts of memory when the sending rate is lower than the queuing
+       rate.
+
+sync_sock_size - INTEGER
+       default 0
+
+       Configuration of SNDBUF (master) or RCVBUF (slave) socket limit.
+       Default value is 0 (preserve system defaults).
+
 snat_reroute - BOOLEAN
        0 - disabled
        not 0 - enabled (default)