Commit 6e34a8b3 authored Jan 28, 2013 by Jesper Dangaard Brouer Committed by David S. Miller Jan 29, 2013

net: cacheline adjust struct inet_frag_queue



Fragmentation code cacheline adjusting of struct inet_frag_queue.

Take advantage of the size of struct timer_list, and move all but
spinlock_t lock, below the timer struct.  On 64-bit 'lru_list',
'list' and 'refcnt', fits exactly into the next cacheline, and a
new cacheline starts at 'fragments'.

The netns_frags *net pointer is moved to the end of the struct,
because its used in a compare, with "next/close-by" elements of
which this struct is embedded into.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 5f8e1e8b

include/net/inet_frag.h

+5 −4

Original line number	Diff line number	Diff line
		@@ -16,12 +16,11 @@ struct netns_frags {
		};

		struct inet_frag_queue {
		struct hlist_node list;
		struct netns_frags *net;
		struct list_head lru_list; /* lru list member */
		spinlock_t lock;
		atomic_t refcnt;
		struct timer_list timer; /* when will this queue expire? */
		struct list_head lru_list; /* lru list member */
		struct hlist_node list;
		atomic_t refcnt;
		struct sk_buff fragments; / list of received fragments */
		struct sk_buff *fragments_tail;
		ktime_t stamp;
		@@ -34,6 +33,8 @@ struct inet_frag_queue {
		#define INET_FRAG_LAST_IN 1

		u16 max_size;

		struct netns_frags *net;
		};

		#define INETFRAGS_HASHSZ 64