netdev - [PATCH 1/1] net: rds: use memset to optimize the recv

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Message-Id: <20180914084538.11666-1-yanjun.zhu@oracle.com>
Date:   Fri, 14 Sep 2018 04:45:38 -0400
From:   Zhu Yanjun <yanjun.zhu@...cle.com>
To:     santosh.shilimkar@...cle.com, davem@...emloft.net,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        rds-devel@....oracle.com
Subject: [PATCH 1/1] net: rds: use memset to optimize the recv

The function rds_inc_init is in recv process. To use memset can optimize
the function rds_inc_init.
The test result:

    Before:
    1) + 24.950 us   |        rds_inc_init [rds]();
    After:
    1) + 10.990 us   |        rds_inc_init [rds]();

Signed-off-by: Zhu Yanjun <yanjun.zhu@...cle.com>
---
 net/rds/recv.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/net/rds/recv.c b/net/rds/recv.c
index 504cd6bcc54c..a9399ddbb7bf 100644
--- a/net/rds/recv.c
+++ b/net/rds/recv.c
@@ -43,8 +43,6 @@
 void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
 		 struct in6_addr *saddr)
 {
-	int i;
-
 	refcount_set(&inc->i_refcount, 1);
 	INIT_LIST_HEAD(&inc->i_item);
 	inc->i_conn = conn;
@@ -53,8 +51,7 @@ void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn,
 	inc->i_rx_tstamp.tv_sec = 0;
 	inc->i_rx_tstamp.tv_usec = 0;
 
-	for (i = 0; i < RDS_RX_MAX_TRACES; i++)
-		inc->i_rx_lat_trace[i] = 0;
+	memset(inc->i_rx_lat_trace, 0, sizeof(inc->i_rx_lat_trace));
 }
 EXPORT_SYMBOL_GPL(rds_inc_init);
 
-- 
2.17.1