diff options
| author | Eric Dumazet <edumazet@google.com> | 2013-06-07 08:48:57 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-06-12 00:25:23 -0700 |
| commit | e9897071350bd9d94a56b5b6f79c85b1a98fc7e7 (patch) | |
| tree | d01026afb4450ef685722cd7a0fe1815336170ca /include | |
| parent | 64153ce0a7b61b2a5cacb01805cbf670142339e9 (diff) | |
igmp: hash a hash table to speedup ip_check_mc_rcu()
After IP route cache removal, multicast applications using
a lot of multicast addresses hit a O(N) behavior in ip_check_mc_rcu()
Add a per in_device hash table to get faster lookup.
This hash table is created only if the number of items in mc_list is
above 4.
Reported-by: Shawn Bohrer <sbohrer@rgmadvisors.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Tested-by: Shawn Bohrer <sbohrer@rgmadvisors.com>
Reviewed-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/igmp.h | 1 | ||||
| -rw-r--r-- | include/linux/inetdevice.h | 5 |
2 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/igmp.h b/include/linux/igmp.h index 7f2bf151848..e3362b5f13e 100644 --- a/include/linux/igmp.h +++ b/include/linux/igmp.h @@ -84,6 +84,7 @@ struct ip_mc_list { struct ip_mc_list *next; struct ip_mc_list __rcu *next_rcu; }; + struct ip_mc_list __rcu *next_hash; struct timer_list timer; int users; atomic_t refcnt; diff --git a/include/linux/inetdevice.h b/include/linux/inetdevice.h index ea1e3b86389..b99cd23f347 100644 --- a/include/linux/inetdevice.h +++ b/include/linux/inetdevice.h @@ -50,12 +50,17 @@ struct ipv4_devconf { DECLARE_BITMAP(state, IPV4_DEVCONF_MAX); }; +#define MC_HASH_SZ_LOG 9 + struct in_device { struct net_device *dev; atomic_t refcnt; int dead; struct in_ifaddr *ifa_list; /* IP ifaddr chain */ + struct ip_mc_list __rcu *mc_list; /* IP multicast filter chain */ + struct ip_mc_list __rcu * __rcu *mc_hash; + int mc_count; /* Number of installed mcasts */ spinlock_t mc_tomb_lock; struct ip_mc_list *mc_tomb; |