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sys cpu usage

Hello all,

What is normal sys CPU usage in %? I have DualCore Xeon with
hyperthreading, so 4 logical CPUs as reported by kernel (,
but the "sys" usage is about 25% (or 97% on scale when max is 400%).
It grows proportionally with normal (user and nice) cpu usage, but
seems too high for me. Server is running etch with php+mysql.

Or is it normal? How can I see what causes it?

Here is graph from munin:

  bYE, Marki

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