[NET]: Improve cache line coherency of ingress qdisc

Move the ingress qdisc members of struct net_device from the transmit
cache line to the receive cache line to avoid cache line ping-pong.
These members are only used on the receive path.

Signed-off-by: Neil Turton <nturton@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 047d432..4ffa49d 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -604,6 +604,10 @@ struct net_device
 
        unsigned char           broadcast[MAX_ADDR_LEN];        /* hw bcast add */
 
+       /* ingress path synchronizer */
+       spinlock_t              ingress_lock;
+       struct Qdisc            *qdisc_ingress;
+
 /*
  * Cache line mostly used on queue transmit path (qdisc)
  */
@@ -617,10 +621,6 @@ struct net_device
        /* Partially transmitted GSO packet. */
        struct sk_buff          *gso_skb;
 
-       /* ingress path synchronizer */
-       spinlock_t              ingress_lock;
-       struct Qdisc            *qdisc_ingress;
-
 /*
  * One part is mostly used on xmit path (device)
  */