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TCP headre compression and CPU usage on Cisco AS5800

  • From: Paul Khavkine
  • Date: Wed Mar 17 17:46:03 2004


Hi folks.

On a cisco AS5800, what are the parameters that could be tweaked to reduce
CPU utilization ?

With 360 active calls here's what i have:

NAS01-MTNDODS#sh proc cpu | exclude 0.00
CPU utilization for five seconds: 79%/17%; one minute: 81%; five minutes:
80%
 PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
   3    80428996   4609093      17450  2.19%  1.08%  0.78%   0 Check heaps
   7   147676920   1554810      94984  2.43%  4.42%  3.93%   0 Serial Backgroun
  29     8102432  16740884        483  0.08%  0.18%  0.18%   0 Net Background
  61    11903404   9770801       1218  0.24%  0.22%  0.23%   0 ISDN
  74   8349756642098634624        397  7.72%  6.99%  6.93%   0 IP Input
  76     3189204   1447125       2203  0.08%  0.04%  0.04%   0 CDP Protocol
  79      665792   8520105         78  0.16%  0.13%  0.10%   0 IP Background
  91      795916   2427196        327  0.08%  0.19%  0.23%   0 PPP IP Route
  92    31107300   5726565       5432 38.09% 45.42% 45.05%   0 PPP IPCP
 120    80886604   2196656      36822  0.73%  0.74%  0.74%   0 Compute load avg
 148    32705256 345451242         94  4.30%  2.52%  2.07%   0 PPP Events
 156     3841144  63989161         60  0.08%  0.06%  0.03%   0 IP SNMP
 158     8978492  27800036        322  0.16%  0.26%  0.16%   0 SNMP ENGINE
 210   222569208   2670597      83340  5.60%  5.39%  4.83%   0 AAA Per-User


As you see that IPCP process takes ~ 45% of the CPU.

Is there a way to disable TCP header compression completely ?
Or any other CPU intensive things ?

It's an AS5800 with NPE-300

Thanx
Paul

************************************************
Paul Khavkine
Network Administrator
DISTRIBUTEL Communications.
740 Notre Dame West, Suite 1135
Montreal, Quebec, Canada, H3C 3X6
1-514-877-5505 x 263
http://www.distributel.net
************************************************





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