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CPU Utilization increase 30-40% after junos upgrade from 11.4 to 15.1?

‎04-10-2019 04:14 PM

Hi all,

 

Appreciate if someone can point me any documentation regarding increasing CPU utilization after junos upgrade from 11.4 to 15.1. My box is MX480 with RE-2000.

 

 

Thanks

8 REPLIES 8
Junos

Re: CPU Utilization increase 30-40% after junos upgrade from 11.4 to 15.1?

‎04-10-2019 04:48 PM

first one , check "show system processes extensive" to find which process uses CPU

Junos

Re: CPU Utilization increase 30-40% after junos upgrade from 11.4 to 15.1?

‎04-10-2019 05:08 PM

Hi,

 

the CPU utilization high intermittent due to snmpd process. But before the junos upgrade the process is not too high after junos upgrade. So if have some documentaion said the CPU expected to increase after junos upgrade then its ok for me.

 

Thanks

Junos

Re: CPU Utilization increase 30-40% after junos upgrade from 11.4 to 15.1?

‎04-11-2019 06:05 AM

Hi,

could you please try

set snmp filter-duplicates

 

Junos

Re: CPU Utilization increase 30-40% after junos upgrade from 11.4 to 15.1?

‎04-11-2019 10:06 AM

Hi Kroniclez,

 

 

I know for a fact that 15 versions are more resource-demanding than legacy versions, I will post if I find documentation on that.

I help you, you help me... please share a Kudos or accepted solution whenever you feel I have helped with your problem! Smiley Happy
Junos

Re: CPU Utilization increase 30-40% after junos upgrade from 11.4 to 15.1?

‎04-16-2019 08:16 AM

Hi Carlos,

 

Thanks and i will waiting your searching doc.

 

 

Thanks again

Junos

Re: CPU Utilization increase 30-40% after junos upgrade from 11.4 to 15.1?

‎04-16-2019 12:24 PM

My customer had a similar behavior after upgrading from 13.3R9 to 15.1R6 the RE-S-2000 in a MX960.

Unfortunately we didn't tshoot because Juniper recommendation for BNG scenario was RE-S-1800x4-8G.

I believe you won't find any official DOC since Junos 16.2 is the last version for RE-S-2000.

There is also a change from where Junos runs, /junos (hard-disk) and /oam volume (CF). Is the opposite behavior until Junos 14. Since RE-S-2000 are too old, disk performance could also impact CPU.

 

Junos

Re: CPU Utilization increase 30-40% after junos upgrade from 11.4 to 15.1?

‎04-16-2019 07:10 PM

Hi Kronicklez,

 

I couldnt find anything for re-2000 I found a PR for MX-2010 and 2020 after an upgrade to 15.1, here in case you want to take a look:

https://prsearch.juniper.net/InfoCenter/index?page=prcontent&id=PR1351708 

 

But I didnt find anything that officially says you must expect a cpu utilization increase on your conditions. I found most of the times the cpu utilization after an upgrade has been fixed during troubleshooting. The fact that the specific process is snmpd is also suspicious. 

you will probably need to troubleshoot it maybe restart snmpd and see if the behavior continues or if you are able to open a case with the JTAC team.

sorry is not much I hope it helps somehow, have a good one!

 

I help you, you help me... please share a Kudos or accepted solution whenever you feel I have helped with your problem! Smiley Happy
Junos

Re: CPU Utilization increase 30-40% after junos upgrade from 11.4 to 15.1?

‎04-19-2019 08:44 PM

If you still see the problem, share the following command output to see which process is eating up the cpu. Run this few times to see if they are stable or spiking. Then you need to work on to identify what those processes are doing.

 

show system processes extensive | except 0.00

Thank You,
SuSi