Kernel_task and syslogd running at 100% CPU under 10.6

Hi
I'm using a MacBook (white) from late 2007. ("MacBook3,1")
I was running 10.5 until recently and after having done a software update, the CPU would constantly run at 100% (and of course the fans run on high speed all the time, which is very annoying).
I found several hints on the web saying that many people have had this problem and the suggested fix was to stop syslogd, delete the asl.db file and restart syslogd:
sudo launchctl stop com.apple.syslogd
sudo rm /var/log/asl.db
sudo launchctl start com.apple.syslogd
I tried that, it didn't help.
So I thought I'd try to upgrade the MacBook to Snow Leopard, since I have the install DVD.
I did that, upgrade ran fine, but sadly the problem with the constant high CPU usage was still there afterwards.
So I wiped the hard drive (actually, I just wiped the OSX partition, not my Bootcamp/Windows partition) and re-installed Snow Leopard from scratch. (it's a "10.6.3" DVD).
I was very surprised to see that this brand new, fresh 10.6 installation was showing the same symptoms:
CPU constantly over 90% usage.
The top processes are "kernel_task" (usually at 100%) and syslogd (usually at 60% or more, with bzip2 hogging up the rest)
I have absolutely no idea what's causing this, since this basic installation of 10.6 shows the same symptoms.
If I boot into Windows XP (Bootcamp), then everything is fine: CPU usage while the computer is idle is pretty much zero and the fans are quiet.
Does anybody have any ideas?
Thanks in advance for your tips!

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lizzie8 wrote:
Hi, I have a system to support that is currently running on Tomcat 4.0 on a Windows Server 2003 R2 SP2 machine with 3.06Ghz, 4Gb Memory, 2Gb Page file connecting to an Oracle 8.1.6 database on a Windows NT 4 virtual server with 3.2Ghz, 1152Mb Memory, 1536Mb Page file.Tomcat 4? We're up to Tomcat 6. The important difference is the JDK supported. What JDK are you using for Tomcat?
>
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Copyright (c) 2009 1stWorks Corporation. All rights reserved.
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jjzz wrote:
I have a store procedure, run in one of database, it hangs in a "create table ... as select ..." statement.
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Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
"Science is more than a body of knowledge; it is a way of thinking"
Carl Sagan

Kernel_task and syslogd running at 100% CPU under 10.6

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