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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2009-10-24 17:13:17 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-10-24 17:13:17 +0400 |
| commit | 7c28bd0b8ec4d128bd7660671d1b626b0abc471f (patch) | |
| tree | dbde8ba53e2059dbd6cb19aca18133b33112ddf5 /include/net/net_namespace.h | |
| parent | 8d5b2c084d2e71587e30a6ef528a8a8051e59dcd (diff) | |
| download | linux-7c28bd0b8ec4d128bd7660671d1b626b0abc471f.tar.xz | |
rtnetlink: speedup rtnl_dump_ifinfo()
When handling large number of netdevice, rtnl_dump_ifinfo()
is very slow because it has O(N^2) complexity.
Instead of scanning one single list, we can use the 256 sub lists
of the dev_index hash table.
This considerably speedups "ip link" operations
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/net_namespace.h')
| -rw-r--r-- | include/net/net_namespace.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h index 699410142bfa..0addd45038ac 100644 --- a/include/net/net_namespace.h +++ b/include/net/net_namespace.h @@ -28,6 +28,10 @@ struct ctl_table_header; struct net_generic; struct sock; + +#define NETDEV_HASHBITS 8 +#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) + struct net { atomic_t count; /* To decided when the network * namespace should be freed. |