topic How can I troubleshoot AP's having a high CPU? I see the command "show cpu detail" and "show system proc state" The cpu detail shows 100% for the cpus and the proc state shows me some cryptic looking services. in Aerohive Migrated Content

How can I troubleshoot AP's having a high CPU? I see the command "show cpu detail" and "show system proc state" The cpu detail shows 100% for the cpus and the proc state shows me some cryptic looking services.

jgraham — Thu, 21 Feb 2019 00:10:00 GMT

How can I troubleshoot AP's having a high CPU? I see the command "show cpu detail" and "show system proc state" The cpu detail shows 100% for the cpus and the proc state shows me some cryptic looking services.

Re: How can I troubleshoot AP's having a high CPU? I see the command "show cpu detail" and "show system proc state" The cpu detail shows 100% for the cpus and the proc state shows me some cryptic looking services.

samantha_lynn — Thu, 21 Feb 2019 00:27:02 GMT

What services are you seeing? If it's MDNSM, could you reboot the AP and see if the CPU spikes right away or takes some time to get back up to 100%? Other things to check for CPU spikes:

Are we using QoS?

Do you have bandsteering enabled in the Radio profile?

Are you using WIPS?

Re: How can I troubleshoot AP's having a high CPU? I see the command "show cpu detail" and "show system proc state" The cpu detail shows 100% for the cpus and the proc state shows me some cryptic looking services.

jgraham — Thu, 21 Feb 2019 00:28:55 GMT

Are we using QoS? no

Do you have bandsteering enabled in the Radio profile? no

Are you using WIPS? no

Re: How can I troubleshoot AP's having a high CPU? I see the command "show cpu detail" and "show system proc state" The cpu detail shows 100% for the cpus and the proc state shows me some cryptic looking services.

jgraham — Thu, 21 Feb 2019 00:29:22 GMT

What steps can I take to troubleshoot the CPU being 100?

Re: How can I troubleshoot AP's having a high CPU? I see the command "show cpu detail" and "show system proc state" The cpu detail shows 100% for the cpus and the proc state shows me some cryptic looking services.

samantha_lynn — Thu, 21 Feb 2019 00:30:40 GMT

That depends on the cause, which we still need to narrow down. What services are you seeing?

Re: How can I troubleshoot AP's having a high CPU? I see the command "show cpu detail" and "show system proc state" The cpu detail shows 100% for the cpus and the proc state shows me some cryptic looking services.

jgraham — Thu, 21 Feb 2019 00:37:05 GMT

What should I be looking for? Is it normal for the CPU to spike to 100? I see others with the same question but there does not seem to be an answer for how to troubleshoot it.

Re: How can I troubleshoot AP's having a high CPU? I see the command "show cpu detail" and "show system proc state" The cpu detail shows 100% for the cpus and the proc state shows me some cryptic looking services.

samantha_lynn — Thu, 21 Feb 2019 00:50:08 GMT

The APs are designed to use their CPU, so high CPU isn't necessarily a problem. They shouldn't be constantly at 100% however, so we need to narrow down the cause. You've stated you aren't using the services that mostly commonly spike the CPU, so we've ruled that out. In your description you mentioned "some cryptic looking services", could you tell me what those were?

A packet capture would also help us get a better look at your traffic to make sure we aren't getting flooded, which is another cause of CPU spiking. Could you run a remote packet capture on the AP you see with 100% CPU? This guide will walk you through how to run a packet capture in HiveManager: https://thehivecommunity.aerohive.com/s/article/Packet-Capture-in-NG

Finally, could you share the results of "Show system process state" and "show cup detail"? If you'd rather send this to me directly, my email is communityhelp@aerohive.com.

Re: How can I troubleshoot AP's having a high CPU? I see the command "show cpu detail" and "show system proc state" The cpu detail shows 100% for the cpus and the proc state shows me some cryptic looking services.

jgraham — Thu, 21 Feb 2019 01:35:39 GMT

Thank you for your suggestion. I will utilize the packet capture option in my future troubleshooting of the issue.