[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 54947ae..39916e7 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 @@
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 @@
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;