> I think this alignment exists to minimize the number of cacheline > bounces on SMP as this can be a pretty hot structure in the network > stack. It could probably benefit from a per-cpu treatment. > Well, this is a mostly read area of memory, dirtied every 5 minutes. Compare this to 'jiffies' for example ;) What could be done is to embed 'ip_cnt' inside ip_keydata[0] for example, to avoid wasting a cache line for one bit ;) c1606c40 b ip_cnt <hole> c1606c80 b ip_keydata -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>