net: doc: add default value for neighbour parameters

Signed-off-by: Shan Wei <davidshan@tencent.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index c6d5fee888c4afa9ad3f9454009b55e0616979a1..0462a71053043196598ef8efa9db0bf5cb74f534 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -30,16 +30,24 @@ neigh/default/gc_thresh3 - INTEGER
        Maximum number of neighbor entries allowed.  Increase this
        when using large numbers of interfaces and when communicating
        with large numbers of directly-connected peers.
+       Default: 1024
 
 neigh/default/unres_qlen_bytes - INTEGER
        The maximum number of bytes which may be used by packets
        queued for each unresolved address by other network layers.
        (added in linux 3.3)
+       Seting negative value is meaningless and will retrun error.
+       Default: 65536 Bytes(64KB)
 
 neigh/default/unres_qlen - INTEGER
        The maximum number of packets which may be queued for each
        unresolved address by other network layers.
        (deprecated in linux 3.3) : use unres_qlen_bytes instead.
+       Prior to linux 3.3, the default value is 3 which may cause
+       secluded packet loss. The current default value is calculated
+       according to default value of unres_qlen_bytes and true size of
+       packet.
+       Default: 31
 
 mtu_expires - INTEGER
        Time, in seconds, that cached PMTU information is kept.