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[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>
This commit is contained in:
Neil Turton 2008-02-12 23:13:48 -08:00 committed by David S. Miller
parent d8b2a4d21e
commit d5bd0146f0
1 changed files with 4 additions and 4 deletions
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8
include/linux/netdevice.h
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@ -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)
*/