2.2 -> 2.4: /proc/net/tcp 10x slower ?

[Sven Rudolph]

Usually identd's on Linux parse /proc/net/tcp.

When migrating from Linux 2.2.17 to 2.4.2 identd became much slower.

I traced it back to the point where /proc/net/tcp is read.

On the same slightly loaded system:

2.2.17 $ time cat /proc/net/tcp >/dev/null
real    0m0.004s
user    0m0.000s
sys     0m0.010s

(Or sometimes 0.000s due to granularity)

2.2.17 $ time cat /proc/net/tcp >/dev/null
real    0m0.083s
user    0m0.000s
sys     0m0.080s

Is this expected? Or is there a more efficient interface that identd
should use?

	Sven