2.2.x Network troubles

From: Peter Zaitsev (pz@spylog.ru)
Date: Thu Jul 20 2000 - 01:45:06 EST

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I'm running 2.2.x kernel in specific network load (web counter serving 15millions of buttons per day). Currently I increased
/proc/sys/net/ipv4/tcp_max_syn_backlog to 2048
/proc/sys/ner/ipv4/route/max_size to 16384

The number of connections open is:

[root@mars dem]# netstat -nt | wc -l
15395
[root@mars dem]# netstat -nt | grep SYN | wc -l
358

So it does not seems to hit the limit of max_syn backlog.

The problem is - it seems in 1-3% of the requests connect takes several seconds which, which is the problem in my case.
Looking at VMSTAT shows 40-60% of CPU is idle anytime.

Any ideas how to solve such problem ?
I have tried several stable kernels from 2.2.14 to 2.2.16 with different patch sets (RedHat,aa-series) all seems to have the same problem....

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