First of all, as you can see in this output, sum of values in 5Sec column are not 63%. Sum of 6.3, 2.53 and so on, are not 63%.
The second point is 39%.In the cisco documentation, the second number named as Time at Interrupt persentage. What does it mean? What interrupt? It says:
Knowing the time spent at interrupt is critical for determining the cause of CPU utilization. The CPU utilization history shows when the CPU is consistently receiving network packets, but it does not show the cause.
Enter the Cisco IOS
show processes cpu sorted 5sec privileged EXEC command to show the current the CPU utilization and which IOS processes are using the most CPU time. In this example, the CPU is too busy because the sustained utilization is over the baseline of 50%.
Anybody can explaint what does it mean and what is time interrupt and infact. Also how should I sum the numbers in the 5Sec column to reach the 63%?
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The sum the the 5-sec CPU column doesn't equal the number you highlighted, it should equal the 1st value less the 2nd value, i.e. 63 - 39 = 24.
"Interrupt" CPU is some of the equivalent of kernel or supervisor time on a typical OS. So total CPU would be the some of this value (39) and the sum of all the individual process values (24).
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