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authorEric Dumazet <dada1@cosmosbay.com>2008-01-22 09:18:34 -0500
committerDavid S. Miller <davem@davemloft.net>2008-01-28 18:10:41 -0500
commit69a73829dbb10e7c8554e66a80cb4fde57347fff (patch)
tree032f67850cd73fc71b573f2a155a5037bde53f71 /include/net/dst.h
parent81566e8322c3f6c6f9a2277fe0e440fee8d917bd (diff)
[DST]: shrinks sizeof(struct rtable) by 64 bytes on x86_64
On x86_64, sizeof(struct rtable) is 0x148, which is rounded up to 0x180 bytes by SLAB allocator. We can reduce this to exactly 0x140 bytes, without alignment overhead, and store 12 struct rtable per PAGE instead of 10. rate_tokens is currently defined as an "unsigned long", while its content should not exceed 6*HZ. It can safely be converted to an unsigned int. Moving tclassid right after rate_tokens to fill the 4 bytes hole permits to save 8 bytes on 'struct dst_entry', which finally permits to save 8 bytes on 'struct rtable' Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/dst.h')
-rw-r--r--include/net/dst.h10
1 files changed, 5 insertions, 5 deletions
diff --git a/include/net/dst.h b/include/net/dst.h
index c45dcc31b3bb..e3ac7d0fc4e1 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -56,7 +56,11 @@ struct dst_entry
56 struct dst_entry *path; 56 struct dst_entry *path;
57 57
58 unsigned long rate_last; /* rate limiting for ICMP */ 58 unsigned long rate_last; /* rate limiting for ICMP */
59 unsigned long rate_tokens; 59 unsigned int rate_tokens;
60
61#ifdef CONFIG_NET_CLS_ROUTE
62 __u32 tclassid;
63#endif
60 64
61 struct neighbour *neighbour; 65 struct neighbour *neighbour;
62 struct hh_cache *hh; 66 struct hh_cache *hh;
@@ -65,10 +69,6 @@ struct dst_entry
65 int (*input)(struct sk_buff*); 69 int (*input)(struct sk_buff*);
66 int (*output)(struct sk_buff*); 70 int (*output)(struct sk_buff*);
67 71
68#ifdef CONFIG_NET_CLS_ROUTE
69 __u32 tclassid;
70#endif
71
72 struct dst_ops *ops; 72 struct dst_ops *ops;
73 73
74 unsigned long lastuse; 74 unsigned long lastuse;