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| 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/linux/inetdevice.h | |
| parent | 64153ce0a7b61b2a5cacb01805cbf670142339e9 (diff) | |
| download | linux-e9897071350bd9d94a56b5b6f79c85b1a98fc7e7.tar.gz linux-e9897071350bd9d94a56b5b6f79c85b1a98fc7e7.tar.bz2 linux-e9897071350bd9d94a56b5b6f79c85b1a98fc7e7.zip | |
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/linux/inetdevice.h')
| -rw-r--r-- | include/linux/inetdevice.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/inetdevice.h b/include/linux/inetdevice.h index ea1e3b863890..b99cd23f3474 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; |