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December 20th, 2020 18:00
What is the command to check dell switch CPU CPU usage information?
Good morning. I have a question about the command to check the dell switch CPU usage information.
In the guide, you can check the cpu usage information with the following two commands.
show process cpu
show process cpu management-unit
However, when I check the cpu usage information on the switch, I see different usage rates.
What is the difference between the two instructions?
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DELL-Tim G
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December 23rd, 2020 06:00
We are distinguishing between control plane and forwarding or data plane in our switches.
The latter is usually referring to the Networking Processing Unit (NPU) or switching ASIC which is in fact doing the "real" work of switching ethernet frames and routing IP packets.
In contrast the control plane is referring to the switch CPU which is running the operating system
The OS is tasked to process control protocols and to programm the NPU accordingly.
"show process cpu" will display the CPU usage of all of these control plane processes which are running under the system deamon "sysdlp".
"show process cpu management-unit" will display the CPU load of the whole operating system including "sysdlp" processes on the management unit if there is a stack configuration (only the stack master will be responsible for control plane tasks).
Regards,
Tim
DiegoLopez
4 Operator
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2.7K Posts
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December 21st, 2020 03:00
Hello @dell_sss,
The "show processes cpu" command displays CPU usage information based on running processes while the show process cpu management-unit displays processes running in the control processor. That's why the values are different.
Regards.
dell_sss
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December 23rd, 2020 00:00
Thanks for the answer. If so, can the control processor be regarded as the operation for the Dell switch to operate? For example, fan operation, LED, input/output, etc.
And the show process cpu command shows the cpu utilization rate from the control processor operation to the traffic operation, so in the image above, the utilization rate was 27%. Is it correct that I understand properly?