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I am running Fedora Core 6 (fully patched). Ever since I installed Fedora, I noticed my CPU idle is ~65-70% via top command. I am puzzled why it would be so low. Ususally, it is 99% idle when not being used. I noticed that 28.6% is being used by si. I don't know what si represents. I man'd top. And, I couldn't find si. (I guess I might have missed it).
Below is a capture of the output of my top command:
I believe si stands for 'swap in', the amount of memory swapped in from disk. But, I thought that was part of the vmstat output, not top. If you're using top, it should tell you what is using your CPU and memory. The bottom half of the top output has a list of processes:
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
8532 weibullguy 16 0 1156 1156 912 R 0.5 0.4 0:11 top