From: Stephen Hemminger <shemminger@osdl.org>
Date: Fri, 9 Dec 2005 19:35:09 +0000 (-0800)
Subject: [PATCH] sky2: prefetch tuning
X-Git-Tag: v2.6.16-rc1~474^2~22^2~7^2~25
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d70cd51ac0585a9273abea4c333e8f0dd8385d27;p=linux-2.6

[PATCH] sky2: prefetch tuning

Add a couple more prefetches to where we walk the rings.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
---

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 54947ae994..39916e7cf6 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -45,6 +45,7 @@
 #include <linux/delay.h>
 #include <linux/workqueue.h>
 #include <linux/if_vlan.h>
+#include <linux/prefetch.h>
 #include <linux/mii.h>
 
 #include <asm/irq.h>
@@ -1248,6 +1249,7 @@ static void sky2_tx_complete(struct sky2_port *sky2, u16 done)
 
   		nxt = re->idx;
 		BUG_ON(nxt >= TX_RING_SIZE);
+		prefetch(sky2->tx_ring + nxt);
 
 		/* Check for partial status */
 		if (tx_dist(put, done) < tx_dist(put, nxt))
@@ -1659,6 +1661,7 @@ static struct sk_buff *sky2_receive(struct sky2_port *sky2,
 		       sky2->netdev->name, sky2->rx_next, status, length);
 
 	sky2->rx_next = (sky2->rx_next + 1) % sky2->rx_pending;
+	prefetch(sky2->rx_ring + sky2->rx_next);
 
 	if (status & GMR_FS_ANY_ERR)
 		goto error;