diff options
| author | Eric Dumazet <dada1@cosmosbay.com> | 2008-01-18 12:33:26 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-29 00:02:46 +0100 |
| commit | a6501e080c318f8d4467679d17807f42b3a33cd5 (patch) | |
| tree | 02ba4422ec6603b2bfddace52b2fabaaa6725496 /net/ipv4/fib_lookup.h | |
| parent | [FIB]: Fix rcu_dereference() abuses in fib_trie.c (diff) | |
| download | linux-a6501e080c318f8d4467679d17807f42b3a33cd5.tar.xz linux-a6501e080c318f8d4467679d17807f42b3a33cd5.zip | |
[IPV4] FIB_HASH: Reduce memory needs and speedup lookups
Currently, sizeof(struct fib_alias) is 24 or 48 bytes on 32/64 bits
arches.
Because of SLAB_HWCACHE_ALIGN requirement, these are rounded to 32 and
64 bytes respectively.
This patch moves rcu to the end of fib_alias, and conditionally
defines it only for CONFIG_IP_FIB_TRIE.
We also remove SLAB_HWCACHE_ALIGN requirement for fib_alias and
fib_node objects because it is not necessary.
(BTW SLUB currently denies it for objects smaller than
cache_line_size() / 2, but not SLAB)
Finally, sizeof(fib_alias) go back to 16 and 32 bytes.
Then, we can embed one fib_alias on each fib_node, to favor locality.
Most of the time access to the fib_alias will be free because one
cache line contains both the list head (fn_alias) and (one of) the
list element.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/fib_lookup.h')
| -rw-r--r-- | net/ipv4/fib_lookup.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/net/ipv4/fib_lookup.h b/net/ipv4/fib_lookup.h index 26ee66d78c18..2c1623d2768b 100644 --- a/net/ipv4/fib_lookup.h +++ b/net/ipv4/fib_lookup.h @@ -7,12 +7,14 @@ struct fib_alias { struct list_head fa_list; - struct rcu_head rcu; struct fib_info *fa_info; u8 fa_tos; u8 fa_type; u8 fa_scope; u8 fa_state; +#ifdef CONFIG_IP_FIB_TRIE + struct rcu_head rcu; +#endif }; #define FA_S_ACCESSED 0x01 |