[patch 1/1] remove last_rx update from loopback device

From: Christoph Lameter <redacted>

The last_rx field in the loopback driver is updated on every xmit but is
not used otherwise.  Accesses to ->last_rx cause unecessary traffic on the
interlink for NUMA systems which limits the performance of the loopback
device.

The comment given at include/linux/netdevice.h says that last_rx may be
used for future network-power-down code, which is likely not relevant for
the loopback device (please let me know if it is otherwise ..).

Signed-off-by: Niraj Kumar <redacted>
Signed-off-by: Christoph Lameter <redacted>
Signed-off-by: Shai Fultheim <redacted>
Signed-off-by: Andrew Morton <redacted>
---

 25-akpm/drivers/net/loopback.c |    2 --
 1 files changed, 2 deletions(-)

diff -puN drivers/net/loopback.c~remove-last_rx-update-from-loopback-device drivers/net/loopback.c

--- 25/drivers/net/loopback.c~remove-last_rx-update-from-loopback-device	Mon Mar  7 16:21:49 2005
+++ 25-akpm/drivers/net/loopback.c	Mon Mar  7 16:21:49 2005

@@ -144,8 +144,6 @@ static int loopback_xmit(struct sk_buff 
 		return 0;
 	}
 
-	dev->last_rx = jiffies;
-
 	lb_stats = &per_cpu(loopback_stats, get_cpu());
 	lb_stats->rx_bytes += skb->len;
 	lb_stats->tx_bytes += skb->len;

_