XGS4600 - 100% CPU Usage every 3 Minutes
stack-1# show cpu-utilization
This is affecting monitoring of our switch as it will not poll from SNMP during high CPU load.
How can we find out what process is causing these CPU spikes?
Best Answers
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Hi @Bash
For starters, we delete another "100% CPU Usage" discussion from you since they're basically identical.
About the CPU high issue, this is a known issue in firmware 4.40. The root cause is that CPU accessing the DDMI info of all connected transceivers at one moment (every 3 mins) and increasing the loading. It's been resolved since firmware 4.50.
Regarding the 4.50 port dropping issue you mentioned in another discussion, let's discuss in specific there.
Zyxel_Lucious
5 -
Hi @Bash
About the request "to know exactly was process is causing the high load":
Given the fact that our switch's platform currently is not able to "calculate" the CPU usage of each process, the additional calculating task may just increase even more CPU loading and cause side effects according to our internal evaluation.
After all, this issue has been found and fixed in newer firmware.
Sincerely,
Zyxel_Lucious
5
All Replies
-
Hi @Bash
For starters, we delete another "100% CPU Usage" discussion from you since they're basically identical.
About the CPU high issue, this is a known issue in firmware 4.40. The root cause is that CPU accessing the DDMI info of all connected transceivers at one moment (every 3 mins) and increasing the loading. It's been resolved since firmware 4.50.
Regarding the 4.50 port dropping issue you mentioned in another discussion, let's discuss in specific there.
Zyxel_Lucious
5 -
Hi @Zyxel_Lucious
Many thanks for the answer. Going forward is there any other commands we can run besides "show cpu-utilization" and looking through the logs?
It would be handy to know exactly was process is causing the high load and do a but more self diagnosis.
Thanks,
Ben0 -
Hi @Bash
About the request "to know exactly was process is causing the high load":
Given the fact that our switch's platform currently is not able to "calculate" the CPU usage of each process, the additional calculating task may just increase even more CPU loading and cause side effects according to our internal evaluation.
After all, this issue has been found and fixed in newer firmware.
Sincerely,
Zyxel_Lucious
5 -
Hi,
we have the same output to syslog as told above with version 4.60 like
2019-06-26T13:59:31+02:00 xyz.telta info -- system: CPU utilization is over 100 and keep 5 seconds, driver count = 33.
2019-06-26T13:59:31+02:00 xyz.telta info -- system: CPU utilization is over 100 and keep 5 seconds, driver count = 36.
2019-06-26T13:58:31+02:00 xyz.telta info -- system: CPU utilization is over 100 and keep 5 seconds, driver count = 12.
2019-06-26T13:58:31+02:00 xyz.telta info -- system: CPU utilization is over 100 and keep 5 seconds, driver count = 13.
2019-06-26T13:58:31+02:00 xyz.telta info -- system: CPU utilization is over 100 and keep 5 seconds, driver count = 8.
2019-06-26T13:58:31+02:00 xyz.telta info -- system: CPU utilization is over 100 and keep 5 seconds, driver count = 75.
The version is:
Current ZyNOS version : V4.60(ABBI.0) | 11/26/2018
Image 1 ZyNOS version : V4.60(ABBI.0) | 11/26/2018
Image 2 ZyNOS version : V4.50(ABBI.1) | 09/11/2017
Btw. an instance of Observium is running against the Switch
0 -
Hi @telta
Welcome to Zyxel community
May I know if you have connected many transceivers on the switch but without fiber cable or the link is down?
And, when you use Observium to poll switch, the switch's CPU rises to 100%?
Also, may I know the frequency of polling switch?
Thanks
Best regards,
Zyxel_Derrick
0
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