[nsp] high cpu load on 2651

[Kinczli Zoltán]

Hello,

  is it only me who find CPU load 80% too high?

router is c2651, sw is 12.2.19
 there is an NM-1A-E3 in the chassis

load is: 20M/10M, 2,7kpps/2,3kpps
   traffic is between an AAL5SNAP encapsulated PVC and Fasteth.
      (the cpu load was the same with ATM/LANE uplink)

Normally there is CAR on the FastEth, and inACLs on both ATM & FastEth,
but the CPU won't calm down neither at removal of the CAR, nor at removal of all the ACLs.

According to published perf data the c2651 can do up to 37-40kpps @64B/pack
We only have 5-6kpps, why is the CPU running around 80%?

Ok, i know CPU util is not clearly linear with kpps value, but 80% at 5-6 kkps is still strange!

Any idea?

thanks
 -zoltan

Router>sh proc cp
CPU utilization for five seconds: 81%/79%; one minute: 80%; five minutes: 82%

verified with 'sh int stat' that almost all traffic is 'handled' at interrupt level.

Router#sh int stat

FastEthernet0/1
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          2        303          5        328
             Route cache      15846    9123763      18252   17428319
                   Total      15848    9124066      18257   17428647
ATM1/0
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor         32       1808         25       4322
             Route cache      18471   17540515      16073    9214657
                   Total      18503   17542323      16098    9218979

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