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rtnetlink: speedup rtnl_dump_ifinfo()

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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>
This commit is contained in:
Eric Dumazet 2009-10-24 06:13:17 -07:00 • committed by David S. Miller
parent 8d5b2c084d
commit 7c28bd0b8e
3 changed files with 29 additions and 17 deletions
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4
include/net/net_namespace.h
View file

@ -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.