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authorEric Dumazet <eric.dumazet@gmail.com>2010-10-08 10:37:34 +0400
committerDavid S. Miller <davem@davemloft.net>2010-10-12 00:06:53 +0400
commitfc66f95c68b6d4535a0ea2ea15d5cf626e310956 (patch)
treeac3a7f08ad741a67ff683bf93e5669ddcae95ed7 /net/ipv4/xfrm4_policy.c
parent0ed8ddf4045fcfcac36bad753dc4046118c603ec (diff)
downloadlinux-fc66f95c68b6d4535a0ea2ea15d5cf626e310956.tar.xz
net dst: use a percpu_counter to track entries
struct dst_ops tracks number of allocated dst in an atomic_t field, subject to high cache line contention in stress workload. Switch to a percpu_counter, to reduce number of time we need to dirty a central location. Place it on a separate cache line to avoid dirtying read only fields. Stress test : (Sending 160.000.000 UDP frames, IP route cache disabled, dual E5540 @2.53GHz, 32bit kernel, FIB_TRIE, SLUB/NUMA) Before: real 0m51.179s user 0m15.329s sys 10m15.942s After: real 0m45.570s user 0m15.525s sys 9m56.669s With a small reordering of struct neighbour fields, subject of a following patch, (to separate refcnt from other read mostly fields) real 0m41.841s user 0m15.261s sys 8m45.949s Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/xfrm4_policy.c')
-rw-r--r--net/ipv4/xfrm4_policy.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
index a580349f0b8a..4464f3bff6a7 100644
--- a/net/ipv4/xfrm4_policy.c
+++ b/net/ipv4/xfrm4_policy.c
@@ -174,7 +174,7 @@ static inline int xfrm4_garbage_collect(struct dst_ops *ops)
struct net *net = container_of(ops, struct net, xfrm.xfrm4_dst_ops);
xfrm4_policy_afinfo.garbage_collect(net);
- return (atomic_read(&ops->entries) > ops->gc_thresh * 2);
+ return (dst_entries_get_slow(ops) > ops->gc_thresh * 2);
}
static void xfrm4_update_pmtu(struct dst_entry *dst, u32 mtu)
@@ -232,7 +232,6 @@ static struct dst_ops xfrm4_dst_ops = {
.ifdown = xfrm4_dst_ifdown,
.local_out = __ip_local_out,
.gc_thresh = 1024,
- .entries = ATOMIC_INIT(0),
};
static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
@@ -288,6 +287,7 @@ void __init xfrm4_init(int rt_max_size)
* and start cleaning when were 1/2 full
*/
xfrm4_dst_ops.gc_thresh = rt_max_size/2;
+ dst_entries_init(&xfrm4_dst_ops);
xfrm4_state_init();
xfrm4_policy_init();