Subject: [PATCH] reduce sizeof(struct inet_peer) from 128 to 64 bytes on 64bits architectures

From: Eric Dumazet <[email-masked]>
Date: Wed, 16 Mar 2005 19:05:45 +0100

As peer_cachep uses kmem_cache_create("inet_peer_cache", ... SLAB_HWCACHE_ALIGN ...),
better try to use exactly 64 bytes instead of 72 for struct inet_peer.

This also means that this structure fits in one cache line on x86_64.

Thank you
Eric Dumazet

# diff -Nru linux-2.6.11/include/net/inetpeer.h linux-2.6.11-ed/include/net/inetpeer.h
--- linux-2.6.11/include/net/inetpeer.h 2005-03-02 08:37:48.000000000 +0100
+++ linux-2.6.11-ed/include/net/inetpeer.h      2005-03-16 18:52:49.000000000 +0100
@@ -19,9 +19,9 @@
  {
         struct inet_peer        *avl_left, *avl_right;
         struct inet_peer        *unused_next, **unused_prevp;
-       atomic_t                refcnt;
         unsigned long           dtime;          /* the time of last use of not
                                                  * referenced entries */
+       atomic_t                refcnt;
         __u32                   v4daddr;        /* peer's address */
         __u16                   avl_height;
         __u16                   ip_id_count;    /* IP ID for the next packet */