From: Ethan Jackson <ethan@nicira.com>
Date: Fri, 22 Jul 2011 00:58:47 +0000 (-0700)
Subject: mac-learning: Fix serious performance bug in the learning table.
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7bbe0453f5c6321c410149755de60324c186a71a;p=openvswitch

mac-learning: Fix serious performance bug in the learning table.

Due to a typo, the mac-learning hash table had dissolved into a
linked list.  This caused a significant reduction in performance.
---

diff --git a/lib/mac-learning.c b/lib/mac-learning.c
index f9f4db3d..ff240e97 100644
--- a/lib/mac-learning.c
+++ b/lib/mac-learning.c
@@ -74,7 +74,7 @@ mac_table_bucket(const struct mac_learning *ml,
                  uint16_t vlan)
 {
     uint32_t hash = mac_table_hash(mac, vlan);
-    const struct list *list = &ml->table[hash & MAC_HASH_BITS];
+    const struct list *list = &ml->table[hash & MAC_HASH_MASK];
     return (struct list *) list;
 }