System cpu usage.

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Hi all,
i have a strange behavior on a system, that has a much high system cpu 
usage, as said by top:

Cpu(s): 26.7%us 73.3%sy 0.0%ni 0.0%id 0.0%wa  0.0%hi, 0.0%si, 0.0%st
Mem:    508220k total,   447044k used,    61176k free,    19920k buffers
Swap:   987988k total,        0k used,   987988k free,   156600k cached


I think it's strange because if I kill the most cpu hungry process, the 
percent of system cpu is spreaded on the other processes, so the situation 
doesnt' change.

how can I debug such a issue?
Is there some /proc/ information that i can examine?

Thanks. Bye!
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