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New Member

CPU load on ISR G2

Hi,

I have a cisco 2900 ISR G2 with a high cpu load and with the command "sh processes cpu sorted", I can't figure which process is the cause

If we look this example, the load is about 25% but the load total of process is around 2%...

CPU utilization for five seconds: 26%/24%; one minute: 23%; five minutes: 25%

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

189       31112  1197414086          0  0.39%  0.35%  0.34%   0 HQF Output Shape

326       77808   346608032          0  0.39%  0.34%  0.32%   0 HSRP Common     

120     9406884   308648542         30  0.31%  0.33%  0.30%   0 IP Input        

   3        1592         928       1715  0.15%  0.24%  0.12% 388 SSH Process     

128       23956   653917473          0  0.15%  0.20%  0.21%   0 Ethernet Msec Ti

342     3340332    58413774         57  0.15%  0.12%  0.13%   0 OSPF-100 Hello  

327     2882656   152727925         18  0.07%  0.07%  0.07%   0 HSRP IPv4       

166       19060   149926818          0  0.07%  0.04%  0.05%   0 IPAM Manager    

  85       33800     4806733          7  0.07%  0.10%  0.08%   0 Per-Second Jobs 

117       11952     9610784          1  0.07%  0.02%  0.01%   0 BPSM stat Proces

122       24040     4801629          5  0.07%  0.00%  0.00%   0 FHRP Main thread

328       13148     4693011          2  0.07%  0.04%  0.05%   0 CFT Timer Proces

  33        1916     5008163          0  0.07%  0.00%  0.00%   0 ARP Background  

  13     3438280       80038      42958  0.00%  0.07%  0.05%   0 Licensing Auto U

Maybe I have missed to look something ?

Thanks for any tips

1 ACCEPTED SOLUTION

Accepted Solutions
Super Bronze

Re: CPU load on ISR G2

Disclaimer

The  Author of this posting offers the information contained within this  posting without consideration and with the reader's understanding that  there's no implied or expressed suitability or fitness for any purpose.  Information provided is for informational purposes only and should not  be construed as rendering professional advice of any kind. Usage of this  posting's information is solely at reader's own risk.

Liability Disclaimer

In  no event shall Author be liable for any damages whatsoever (including,  without limitation, damages for loss of use, data or profit) arising out  of the use or inability to use the posting's information even if Author  has been advised of the possibility of such damage.

Posting

Usually.  In your case, 24% is interrupt CPU and 2% is other process CPU.  Interrupt CPU within 2 to 4 percent of total CPU is generally good.

What you might check, is whether the interrupt CPU appears to corresponds to the total traffic passing through your router and rough match that router's documented PPS (packets per second) rate.  If the PPS rate seems abnormally low, you might have packets causing extra forwarding load.  It can be difficult to identify cause for this as we don't have much visibility into "interrupt" forwarding.

3 REPLIES
Super Bronze

Re: CPU load on ISR G2

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

The bulk of your CPU is "interrupt" CPU which normally is the CPU load for forwarding "normal" traffic.

New Member

CPU load on ISR G2

Thanks joseph

so the remaining cpu use is for forwarding process right ?

Super Bronze

Re: CPU load on ISR G2

Disclaimer

The  Author of this posting offers the information contained within this  posting without consideration and with the reader's understanding that  there's no implied or expressed suitability or fitness for any purpose.  Information provided is for informational purposes only and should not  be construed as rendering professional advice of any kind. Usage of this  posting's information is solely at reader's own risk.

Liability Disclaimer

In  no event shall Author be liable for any damages whatsoever (including,  without limitation, damages for loss of use, data or profit) arising out  of the use or inability to use the posting's information even if Author  has been advised of the possibility of such damage.

Posting

Usually.  In your case, 24% is interrupt CPU and 2% is other process CPU.  Interrupt CPU within 2 to 4 percent of total CPU is generally good.

What you might check, is whether the interrupt CPU appears to corresponds to the total traffic passing through your router and rough match that router's documented PPS (packets per second) rate.  If the PPS rate seems abnormally low, you might have packets causing extra forwarding load.  It can be difficult to identify cause for this as we don't have much visibility into "interrupt" forwarding.

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