diff -ruN -X dontdiff linux-2.5.38/drivers/net/loopback.c statctr-2.5.38/drivers/net/loopback.c
--- linux-2.5.38/drivers/net/loopback.c	Sun Sep 22 09:55:01 2002
+++ statctr-2.5.38/drivers/net/loopback.c	Wed Sep 25 12:42:15 2002
@@ -39,6 +39,7 @@
 #include <linux/fcntl.h>
 #include <linux/in.h>
 #include <linux/init.h>
+#include <linux/statctr.h>
 
 #include <asm/system.h>
 #include <asm/uaccess.h>
@@ -115,13 +116,23 @@
 	dev_kfree_skb(skb);
 }
 
+/* Use statctrs for frequently used statistics counters. Using statctr avoids
+ * in smp. 
+ */
+
+struct fast_loopback_stats {
+	struct statctr rx_bytes;
+	struct statctr tx_bytes;
+	struct statctr rx_packets;
+	struct statctr tx_packets;
+} lstats;
+
 /*
  * The higher levels take care of making this non-reentrant (it's
  * called with bh's disabled).
  */
 static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
 {
-	struct net_device_stats *stats = (struct net_device_stats *)dev->priv;
 
 	/*
 	 *	Optimise so buffers with skb->free=1 are not copied but
@@ -160,10 +171,10 @@
 	}
 
 	dev->last_rx = jiffies;
-	stats->rx_bytes+=skb->len;
-	stats->tx_bytes+=skb->len;
-	stats->rx_packets++;
-	stats->tx_packets++;
+	statctr_add(&lstats.rx_bytes, skb->len);
+	statctr_add(&lstats.tx_bytes, skb->len);
+	statctr_inc(&lstats.rx_packets);
+	statctr_inc(&lstats.tx_packets);
 
 	netif_rx(skb);
 
@@ -172,6 +183,11 @@
 
 static struct net_device_stats *get_stats(struct net_device *dev)
 {
+	struct net_device_stats *stats = (struct net_device_stats *)dev->priv;
+	stats->rx_bytes = statctr_read(&lstats.rx_bytes);
+	stats->tx_bytes = statctr_read(&lstats.tx_bytes);
+	stats->rx_packets = statctr_read(&lstats.rx_packets);
+	stats->tx_packets = statctr_read(&lstats.tx_packets);
 	return (struct net_device_stats *)dev->priv;
 }
 
@@ -200,6 +216,13 @@
 	if (dev->priv == NULL)
 			return -ENOMEM;
 	memset(dev->priv, 0, sizeof(struct net_device_stats));
+	
+	if (statctr_ninit(NULL, GFP_KERNEL, 4, &lstats.tx_bytes, 
+				&lstats.rx_bytes, &lstats.tx_packets, 
+				&lstats.rx_packets)) {
+		kfree(dev->priv);
+		return -ENOMEM;
+	}
 	dev->get_stats = get_stats;
 
 	/*