Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5f58a5c8725b48f3e32851f9748527c8d1ff71b2
Commit: 5f58a5c8725b48f3e32851f9748527c8d1ff71b2
Parent: 4136cd523eb0c0bd53173e16fd7406d31d05824f
Author: Eric Dumazet <[EMAIL PROTECTED]>
AuthorDate: Thu Feb 7 18:03:18 2008 -0800
Committer: David S. Miller <[EMAIL PROTECTED]>
CommitDate: Thu Feb 7 18:03:18 2008 -0800
[IPSEC] flow: Remove an unnecessary ____cacheline_aligned
We use a percpu variable named flow_hash_info, which holds 12 bytes.
It is currently marked as ____cacheline_aligned, which makes linker
skip space to properly align this variable.
Before :
c065cc90 D per_cpu__softnet_data
c065cd00 d per_cpu__flow_tables
<Here, hole of 124 bytes>
c065cd80 d per_cpu__flow_hash_info
<Here, hole of 116 bytes>
c065ce00 d per_cpu__flow_flush_tasklets
c065ce14 d per_cpu__rt_cache_stat
This alignement is quite unproductive, and removing it reduces the
size of percpu data (by 240 bytes on my x86 machine), and improves
performance (flow_tables & flow_hash_info can share a single cache
line)
After patch :
c065cc04 D per_cpu__softnet_data
c065cc4c d per_cpu__flow_tables
c065cc50 d per_cpu__flow_hash_info
c065cc5c d per_cpu__flow_flush_tasklets
c065cc70 d per_cpu__rt_cache_stat
Signed-off-by: Eric Dumazet <[EMAIL PROTECTED]>
Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
---
net/core/flow.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/net/core/flow.c b/net/core/flow.c
index 46b38e0..9cfe845 100644
--- a/net/core/flow.c
+++ b/net/core/flow.c
@@ -52,7 +52,7 @@ struct flow_percpu_info {
int hash_rnd_recalc;
u32 hash_rnd;
int count;
-} ____cacheline_aligned;
+};
static DEFINE_PER_CPU(struct flow_percpu_info, flow_hash_info) = { 0 };
#define flow_hash_rnd_recalc(cpu) \
-
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