Performance question

From: Jan Dreyer (dreyerja@uni-paderborn.de)
Date: Wed Apr 02 2008 - 07:19:44 EST


Hi managers,

we have a E3500 (5.10 Generic_127111-06) with some trouble completing
it's job(s). The problem is, I can't identify the source of the dilemma.

sar shows:
13:55:17 %usr %sys %wio %idle
13:55:19 11 89 0 0
13:55:20 10 88 0 2
13:55:24 10 89 0 1
13:55:26 10 89 0 1
13:55:27 9 91 0 0
13:55:29 6 94 0 0
13:55:31 4 96 0 0

so the processes are in system mode about 85-99%! That's way too much.
But I can't see, why this occurs. Obviously there is few IO, so this
doesn't block.

Dtrace seems the answer, but I have no idea which of the millions of
screws I shall turn there ...

Any hints here, where and how to look?

Greetings and thanks in advance
Jan Dreyer
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