Start by looking at the cpu resources following this tech document. This will let you know what process is at issue.
First of all, we need to identify which CPU is high, MP CPU (management-plane) or DP CPU (data-plane)...?
The above documents will help you for MP-CPU. From the GUI of the PAN firewall, if you go to Dashboard >> @ bottom left corner, it will show you the CPU utilization.
NOTE: To understand DP CPU, you can apply below mentioned CLI commands.
CLI> show running resource-monitor
CLI> show session info
CLI> show session meter
CLI> Debug data-plane pool statistics
CLI>> show counter global filter delta yes >>>>>>>> Run this command 10 times with a 5 sec interval.
Hope this helps.
What PanOS version are you running, and which CPU is under the load?
If it's the management CPU, and the spike is every 5 minutes or so, there's nothing you can do about it. Version 6 is supposed to help in reducing these spikes, but it's caused by the log index process, which kicks off every 5 minutes, and will normally kick your management CPU up to 60-70% for a couple of minutes.
As I said, V6 is supposed to fix this - haven't installed V6 yet, so I can't comment one way or another if it does.
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