ipv4: 16 slots in initial fib_info hash table

A small host typically needs ~10 fib_info structures, so create initial
hash table with 16 slots instead of only one. This removes potential
false sharing and reallocs/rehashes (1->2->4->8->16)

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 71b125cd5db18a3af37d124d4eb3495f3e03fdea..4797a800faf809dd7fae7c958de67181d67e58d2 100644 (file)
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -803,7 +803,7 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
                unsigned int bytes;
 
                if (!new_size)
-                       new_size = 1;
+                       new_size = 16;
                bytes = new_size * sizeof(struct hlist_head *);
                new_info_hash = fib_info_hash_alloc(bytes);
                new_laddrhash = fib_info_hash_alloc(bytes);