[c-nsp] RE: Unknown reason for High CPU 3620

[Alex Foster]

Thanks to the guys who responded - I have managed to narrow down the
cause to high interrupt utilization and not processor utilization - but
Im still a little unclear as to what is causing the high interrupt util.
- is the ATM interface causing this ?  Again the traffic load is little
over 1.5 meg (in/out) - but constant - so I am wondering if the
continual SARing is maybe having a negative effect on the CPU ?  If so -
is there a workaround or am I looking at a bigger platform to solve the
issue - if so any recommendations (I have a 3640 available but don't
know if this will provide much of an improvement).

 

Regards

 

Alex

 

 

-----Original Message-----
From: Alex Foster 
Sent: 03 November 2004 13:37
To: 'cisco-nsp at puck.nether.net'
Subject: Unknown reason for High CPU 3620

 

I have a 3620 that is currently maxing out its CPU for no apparent
reason - the traffic load on it at the moment is about 1 to 2 meg - and
sh proc cpu doesn't indicate any process that is causing the high CPU
util.  Most of the traffic is SIP but I wouldn't have thought this would
have any bearing.  There are only two interfaces on the box in use - an
ATM 155 and a 10bt.  The traffic from the 10bt is bridged to a PVC on
the ATM interface - nothing complicated.  

 

#sh proc cpu

CPU utilization for five seconds: 96%/93%; one minute: 90%; five
minutes: 91%

 PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process

   1      194708       9899756         19    0.00%  0.00%  0.00%   0
Load Meter

   2        2008          223                9004  1.41%  0.13%  0.03%
66 Virtual Exec

 

#sh mem sum

                Head    Total(b)     Used(b)     Free(b)   Lowest(b)
Largest(b)

Processor   61D70EA0    12120416     6616992     5503424     5303744
5305428

      I/O    2900000     7340032     4387068     2952964     2920520
2947260

 

#sh int e1/0

Ethernet1/0 is up, line protocol is up

  Hardware is AmdP2, address is 0005.3245.e070 (bia 0005.3245.e070)

  Description: 

  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,

     reliability 255/255, txload 34/255, rxload 37/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:00, output 00:00:00, output hang never

  Last clearing of "show interface" counters 1y4w

  Queueing strategy: fifo

  Output queue 0/40, 0 drops; input queue 0/75, 103522 drops

  5 minute input rate 1470000 bits/sec, 1984 packets/sec

  5 minute output rate 1355000 bits/sec, 2166 packets/sec

     2150894411 packets input, 1646909945 bytes, 0 no buffer

     Received 88151770 broadcasts, 0 runts, 0 giants, 0 throttles

     6397644 input errors, 42166 CRC, 32878 frame, 0 overrun, 6355422
ignored

     0 input packets with dribble condition detected

     2681876495 packets output, 1769855380 bytes, 0
underruns(556991/1663306/0)

     165 output errors, 2220297 collisions, 50 interface resets

     0 babbles, 47 late collision, 1067254 deferred

     118 lost carrier, 0 no carrier

     0 output buffer failures, 0 output buffers swapped out

 

#sh int atm 0/0.2

ATM0/0.2 is up, line protocol is up

  Hardware is RS8234 ATMOC3

  MTU 4470 bytes, BW 155000 Kbit, DLY 80 usec,

     reliability 255/255, txload 2/255, rxload 2/255

  Encapsulation ATM

  3075506957 packets input, 1094442885139 bytes

  2362546968 packets output,988686523562 bytes

  0 OAM cells input, 0 OAM cells output

  AAL5 CRC errors : 81

  AAL5 SAR Timeouts : 0

  AAL5 Oversized SDUs : 0

  AAL5 length violation : 26

  AAL5 CPI Error : 0

 

Thanks 

 

Alex



The information in this e-mail and any attachments is confidential and may be subject to legal professional privilege. It is intended solely for the attention and use of the named addressee(s). If you are not the intended recipient, or person responsible for delivering this information to the intended recipient, please notify the sender immediately. Unless you are the intended recipient or his/her representative you are prohibited from, and therefore must not, read, copy, distribute, use or retain this message or any part of it. The views expressed in this e-mail may not represent those of Gamma Telecom.

This message has been scanned for viruses by MailController