dpif-netdev: Increase the number of EMC entries

Prior to this commit, the number of possible entries in the Exact
Match Cache stood at 1024 per thread exacting to 0.18Mb. A typical
server system will have 2.5Mb cache per core meaning a larger EMC will
comfortably fit in. This patch increases the number of entries to 8192
per thread (1.4Mb) which in turn yields improved throughput when
processing multiple flows of traffic.

Signed-off-by: Ciara Loftus <ciara.loftus@intel.com>
Signed-off-by: Ethan Jackson <ethan@nicira.com>
Acked-by: Daniele Di Proietto <diproiettod@vmware.com>
Acked-by: Ethan Jackson <ethan@nicira.com>

diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
index fb01a02..b4a42eb 100644 (file)
--- a/lib/dpif-netdev.c
+++ b/lib/dpif-netdev.c
@@ -117,7 +117,7 @@ struct netdev_flow_key {
  * If dp_netdev_input is not called from a pmd thread, a mutex is used.
  */
 
-#define EM_FLOW_HASH_SHIFT 10
+#define EM_FLOW_HASH_SHIFT 13
 #define EM_FLOW_HASH_ENTRIES (1u << EM_FLOW_HASH_SHIFT)
 #define EM_FLOW_HASH_MASK (EM_FLOW_HASH_ENTRIES - 1)
 #define EM_FLOW_HASH_SEGS 2