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authorEric Dumazet <eric.dumazet@gmail.com>2011-11-08 13:04:43 +0000
committerDavid S. Miller <davem@davemloft.net>2011-11-09 16:04:20 -0500
commitacb32ba3dee66d58704caeeb8c6ff95f60efdc66 (patch)
treeb5c1d6d5575a7b75c7c816e0809690f58401715c /include/net/netns
parente56c57d0d3fdbbdf583d3af96bfb803b8dfa713e (diff)
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op-kernel-dev-acb32ba3dee66d58704caeeb8c6ff95f60efdc66.tar.gz
ipv4: reduce percpu needs for icmpmsg mibs
Reading /proc/net/snmp on a machine with a lot of cpus is very expensive (can be ~88000 us). This is because ICMPMSG MIB uses 4096 bytes per cpu, and folding values for all possible cpus can read 16 Mbytes of memory. ICMP messages are not considered as fast path on a typical server, and eventually few cpus handle them anyway. We can afford an atomic operation instead of using percpu data. This saves 4096 bytes per cpu and per network namespace. 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/mib.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/netns/mib.h b/include/net/netns/mib.h
index 0b44112..f360135 100644
--- a/include/net/netns/mib.h
+++ b/include/net/netns/mib.h
@@ -10,7 +10,7 @@ struct netns_mib {
DEFINE_SNMP_STAT(struct udp_mib, udp_statistics);
DEFINE_SNMP_STAT(struct udp_mib, udplite_statistics);
DEFINE_SNMP_STAT(struct icmp_mib, icmp_statistics);
- DEFINE_SNMP_STAT(struct icmpmsg_mib, icmpmsg_statistics);
+ DEFINE_SNMP_STAT_ATOMIC(struct icmpmsg_mib, icmpmsg_statistics);
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
struct proc_dir_entry *proc_net_devsnmp6;
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