[PATCH 2/5] ipvs: fix sync_threshold description and add sync_refresh_period, sync_retries

[Simon Horman <horms@xxxxxxxxxxxx>]

From: Hangbin Liu <liuhangbin@xxxxxxxxx>

Fix sync_threshold description which should have two values. Also add
sync_refresh_period and sync_retries based on commit 749c42b620a9
("ipvs: reduce sync rate with time thresholds").

Signed-off-by: Hangbin Liu <liuhangbin@xxxxxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
---
 Documentation/networking/ipvs-sysctl.txt | 40 +++++++++++++++++++++++++-------
 1 file changed, 31 insertions(+), 9 deletions(-)

diff --git a/Documentation/networking/ipvs-sysctl.txt 
b/Documentation/networking/ipvs-sysctl.txt
index e6b1c025fdd8..7acaaa65451e 100644
--- a/Documentation/networking/ipvs-sysctl.txt
+++ b/Documentation/networking/ipvs-sysctl.txt
@@ -185,15 +185,37 @@ secure_tcp - INTEGER
         The value definition is the same as that of drop_entry and
         drop_packet.
 
-sync_threshold - INTEGER
-        default 3
-
-        It sets synchronization threshold, which is the minimum number
-        of incoming packets that a connection needs to receive before
-        the connection will be synchronized. A connection will be
-        synchronized, every time the number of its incoming packets
-        modulus 50 equals the threshold. The range of the threshold is
-        from 0 to 49.
+sync_threshold - vector of 2 INTEGERs: sync_threshold, sync_period
+       default 3 50
+
+       It sets synchronization threshold, which is the minimum number
+       of incoming packets that a connection needs to receive before
+       the connection will be synchronized. A connection will be
+       synchronized, every time the number of its incoming packets
+       modulus sync_period equals the threshold. The range of the
+       threshold is from 0 to sync_period.
+
+       When sync_period and sync_refresh_period are 0, send sync only
+       for state changes or only once when pkts matches sync_threshold
+
+sync_refresh_period - UNSIGNED INTEGER
+       default 0
+
+       In seconds, difference in reported connection timer that triggers
+       new sync message. It can be used to avoid sync messages for the
+       specified period (or half of the connection timeout if it is lower)
+       if connection state is not changed since last sync.
+
+       This is useful for normal connections with high traffic to reduce
+       sync rate. Additionally, retry sync_retries times with period of
+       sync_refresh_period/8.
+
+sync_retries - INTEGER
+       default 0
+
+       Defines sync retries with period of sync_refresh_period/8. Useful
+       to protect against loss of sync messages. The range of the
+       sync_retries is from 0 to 3.
 
 snat_reroute - BOOLEAN
        0 - disabled
-- 
2.7.0.rc3.207.g0ac5344

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