[NET]: Reorder fields of struct dst_entry
This last patch (but not least :) ) finally moves the next pointer at the end of struct dst_entry. This permits to perform route cache lookups with a minimal cost of one cache line per entry, instead of two. Both 32bits and 64bits platforms benefit from this new layout. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -37,14 +37,7 @@ struct sk_buff;
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struct dst_entry
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struct dst_entry
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{
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{
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union {
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struct rcu_head rcu_head;
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struct dst_entry *next;
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struct rtable *rt_next;
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struct rt6_info *rt6_next;
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struct dn_route *dn_next;
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};
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atomic_t __refcnt; /* client references */
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int __use;
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struct dst_entry *child;
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struct dst_entry *child;
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struct net_device *dev;
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struct net_device *dev;
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short error;
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short error;
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@ -55,7 +48,6 @@ struct dst_entry
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#define DST_NOPOLICY 4
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#define DST_NOPOLICY 4
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#define DST_NOHASH 8
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#define DST_NOHASH 8
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#define DST_BALANCED 0x10
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#define DST_BALANCED 0x10
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unsigned long lastuse;
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unsigned long expires;
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unsigned long expires;
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unsigned short header_len; /* more space at head required */
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unsigned short header_len; /* more space at head required */
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@ -80,8 +72,16 @@ struct dst_entry
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#endif
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#endif
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struct dst_ops *ops;
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struct dst_ops *ops;
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struct rcu_head rcu_head;
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unsigned long lastuse;
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atomic_t __refcnt; /* client references */
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int __use;
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union {
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struct dst_entry *next;
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struct rtable *rt_next;
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struct rt6_info *rt6_next;
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struct dn_route *dn_next;
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};
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char info[0];
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char info[0];
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};
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};
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