From 5f58a5c8725b48f3e32851f9748527c8d1ff71b2 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Thu, 7 Feb 2008 18:03:18 -0800 Subject: [PATCH] [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 c065cd80 d per_cpu__flow_hash_info 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 Signed-off-by: David S. Miller --- net/core/flow.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/core/flow.c b/net/core/flow.c index 46b38e06e0d..9cfe84571ca 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) \ -- 2.41.1