ipvs: add sync_persist_mode flag

Add sync_persist_mode flag to reduce sync traffic
by syncing only persistent templates.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Tested-by: Aleksey Chudov <aleksey.chudov@gmail.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

1 files changed, 13 insertions, 0 deletions

diff --git a/Documentation/networking/ipvs-sysctl.txt b/Documentation/networking/ipvs-sysctl.txt
index 9573d0c48c6e..7a3c04729591 100644
--- a/Documentation/networking/ipvs-sysctl.txt
+++ b/Documentation/networking/ipvs-sysctl.txt
@@ -181,6 +181,19 @@ snat_reroute - BOOLEAN
         always be the same as the original route so it is an optimisation
         to disable snat_reroute and avoid the recalculation.
 
+sync_persist_mode - INTEGER
+        default 0
+
+        Controls the synchronisation of connections when using persistence
+
+        0: All types of connections are synchronised
+        1: Attempt to reduce the synchronisation traffic depending on
+        the connection type. For persistent services avoid synchronisation
+        for normal connections, do it only for persistence templates.
+        In such case, for TCP and SCTP it may need enabling sloppy_tcp and
+        sloppy_sctp flags on backup servers. For non-persistent services
+        such optimization is not applied, mode 0 is assumed.
+
 sync_version - INTEGER
         default 1