[Qemu-devel] [PATCH V4 2/3] net/colo-compare.c: Adjust net queue pop order for performance

[Zhang Chen <zhangchen.fnst@cn.fujitsu.com>]

The packet_enqueue() use g_queue_push_tail() to
enqueue net packet, so it is more efficent way use
g_queue_pop_head() to get packet for compare.
That will improve the success rate of comparison.
In my test the performance of ftp put 1000M file
will increase 10%

Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
---
 net/colo-compare.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/colo-compare.c b/net/colo-compare.c
index f6bda41..a8ccac7 100644
--- a/net/colo-compare.c
+++ b/net/colo-compare.c
@@ -483,7 +483,7 @@ static void colo_compare_connection(void *opaque, void *user_data)
 
     while (!g_queue_is_empty(&conn->primary_list) &&
            !g_queue_is_empty(&conn->secondary_list)) {
-        pkt = g_queue_pop_tail(&conn->primary_list);
+        pkt = g_queue_pop_head(&conn->primary_list);
         switch (conn->ip_proto) {
         case IPPROTO_TCP:
             result = g_queue_find_custom(&conn->secondary_list,
@@ -521,7 +521,7 @@ static void colo_compare_connection(void *opaque, void *user_data)
              * until next comparison.
              */
             trace_colo_compare_main("packet different");
-            g_queue_push_tail(&conn->primary_list, pkt);
+            g_queue_push_head(&conn->primary_list, pkt);
             /* TODO: colo_notify_checkpoint();*/
             break;
         }
-- 
2.7.4