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CPU usage in 'sessions widget' vs 'CPU' widget?

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The firewall in question is a 40F running v6.4.9. So the sessions widget is saying:

'Current sessions: 402 CPU: 83.6% SPU: 0.0% nTurbo: 16.6%'

The CPU number seems awful high since there isn't much going on at the moment. What has me confused:

The 'CPU' widget shows CPU utilization fluctuating around 1%. I'd appreciate any tips as to the discrepancy.

FortiGate

Anthony_EAnswer

Staff

Hello druber,

Thank you for using the Community Forum.

I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible.

Regards,

Best Regards

Anthony_EAnswer

Staff

Hello druber,

Thank you for using the Community Forum.

I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible.

Regards,

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Best Regards

druberAuthor

New Member

Ah, 1000 thanks. That makes perfect sense!

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Anthony_E

Staff

Hello druber,

I have found this documentation:

https://docs.fortinet.com/document/fortigate/6.2.3/cookbook/232929/troubleshooting-high-cpu-usage

Could you please tell me if it helps?

Regards,

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FriedBacon

Visitor III

Everything you're seeing there is normal. Dont be confused on the CPU Utilization (in your case 1%) and the Session Utilization CPU. The Session CPU your seeing is there (the 83.6%) means basically that 83.6% of your total no. of sessions that is processed by FortiGate is being handeld by your FortiGate's discreet CPU. In terms of CPU utilization; just look at 1%

If i were to put it in a sentence; currently your CPU usage is 1%, and 83.6% of your sessions is being handled by that 1% (among other services/daemons)

Here's a KB for it as well: https://community.fortinet.com/t5/FortiGate/Technical-Tip-Understanding-the-meaning-of-Session-CPU/ta-p/211075

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