neigh: document gc_thresh2

Missing documentation for gc_thresh2 sysctl.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 29a93518bf18acc7d9a0a3ac443abd03662e3792..3cce8ea6b139ddc013253f0bc129e5c7052f19d6 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -65,6 +65,12 @@ neigh/default/gc_thresh1 - INTEGER
        purge entries if there are fewer than this number.
        Default: 128
 
+neigh/default/gc_thresh2 - INTEGER
+       Threshold when garbage collector becomes more aggressive about
+       purging entries. Entries older than 5 seconds will be cleared
+       when over this number.
+       Default: 512
+
 neigh/default/gc_thresh3 - INTEGER
        Maximum number of neighbor entries allowed.  Increase this
        when using large numbers of interfaces and when communicating