[IPV4] inet_peer: Group together avl_left, avl_right, v4daddr to speedup lookups on some CPUS (78d79423) · Commits · 戴 / test

Lot of routers/embedded devices still use CPUS with 16/32 bytes cache lines. (486, Pentium, ... PIII) It makes sense to group together fields used at lookup time so they fit in one cache line. This reduce cache footprint and speedup lookups. Signed-off-by:

Eric Dumazet <dada1@cosmosbay.com> Signed-off-by:

David S. Miller <davem@davemloft.net>

include/net/inetpeer.h

+4 −3

Original line number	Diff line number	Diff line
		@@ -17,14 +17,15 @@

		struct inet_peer
		{
		/* group together avl_left,avl_right,v4daddr to speedup lookups */
		struct inet_peer avl_left, avl_right;
		__be32 v4daddr; /* peer's address */
		__u16 avl_height;
		__u16 ip_id_count; /* IP ID for the next packet */
		struct inet_peer unused_next, *unused_prevp;
		__u32 dtime; /* the time of last use of not
		* referenced entries */
		atomic_t refcnt;
		__be32 v4daddr; /* peer's address */
		__u16 avl_height;
		__u16 ip_id_count; /* IP ID for the next packet */
		atomic_t rid; /* Frag reception counter */
		__u32 tcp_ts;
		unsigned long tcp_ts_stamp;

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