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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-10-14 05:56:18 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-10-17 13:49:14 -0700 |
| commit | 8e602ce2980fd6941dc0d3dda12e5095e8206f34 (patch) | |
| tree | 1a0ea79a6db1b01660cc034c822d02c95e356388 /include/net/netns | |
| parent | c60ce4e265404ca42ba860401f4b0f1e97332a67 (diff) | |
| download | linux-3.10-8e602ce2980fd6941dc0d3dda12e5095e8206f34.tar.gz linux-3.10-8e602ce2980fd6941dc0d3dda12e5095e8206f34.tar.bz2 linux-3.10-8e602ce2980fd6941dc0d3dda12e5095e8206f34.zip | |
netns: reorder fields in struct net
In a network bench, I noticed an unfortunate false sharing between
'loopback_dev' and 'count' fields in "struct net".
'count' is written each time a socket is created or destroyed, while
loopback_dev might be often read in routing code.
Move loopback_dev in a read mostly section of "struct net"
Note: struct netns_xfrm is cache line aligned on SMP.
(It contains a "struct dst_ops")
Move it at the end to avoid holes, and reduce sizeof(struct net) by 128
bytes on ia32.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/netns')
| -rw-r--r-- | include/net/netns/xfrm.h | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/include/net/netns/xfrm.h b/include/net/netns/xfrm.h index 74f119a2829..748f91f87cd 100644 --- a/include/net/netns/xfrm.h +++ b/include/net/netns/xfrm.h @@ -43,10 +43,6 @@ struct netns_xfrm { unsigned int policy_count[XFRM_POLICY_MAX * 2]; struct work_struct policy_hash_work; - struct dst_ops xfrm4_dst_ops; -#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) - struct dst_ops xfrm6_dst_ops; -#endif struct sock *nlsk; struct sock *nlsk_stash; @@ -58,6 +54,11 @@ struct netns_xfrm { #ifdef CONFIG_SYSCTL struct ctl_table_header *sysctl_hdr; #endif + + struct dst_ops xfrm4_dst_ops; +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + struct dst_ops xfrm6_dst_ops; +#endif }; #endif |