1 files changed, 15 insertions, 0 deletions

diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index 4acc308eac7f..611cffcf554f 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -323,6 +323,7 @@ static struct ctl_table_header *sysctl_hdr;
 int __init xfrm6_init(void)
 {
         int ret;
+        unsigned int gc_thresh;
 
         ret = xfrm6_policy_init();
         if (ret)
@@ -331,6 +332,20 @@ int __init xfrm6_init(void)
         ret = xfrm6_state_init();
         if (ret)
                 goto out_policy;
+        /*
+         * We need a good default value for the xfrm6 gc threshold.
+         * In ipv4 we set it to the route hash table size * 8, which
+         * is half the size of the maximaum route cache for ipv4.  It
+         * would be good to do the same thing for v6, except the table is
+         * constructed differently here.  Here each table for a net namespace
+         * can have FIB_TABLE_HASHSZ entries, so lets go with the same
+         * computation that we used for ipv4 here.  Also, lets keep the initial
+         * gc_thresh to a minimum of 1024, since, the ipv6 route cache defaults
+         * to that as a minimum as well
+         */
+        gc_thresh = FIB6_TABLE_HASHSZ * 8;
+        xfrm6_dst_ops.gc_thresh = (gc_thresh < 1024) ? 1024 : gc_thresh;
+
         sysctl_hdr = register_net_sysctl_table(&init_net, net_ipv6_ctl_path,
                                                 xfrm6_policy_table);
 out: