Weird 25 % CPU Usage on IBM Netfinity 5500 M20

I have a IBM Netfinity 5500 M20 with 3 CPU's. Since installing Windows 2000 the server gets about 60000 interrupts/second (20000/CPU). I've read that this can be related to ACPI. But when I check the BIOS for the motherboard it says that it's fixed ACPI support for Windows 2000 in version 1.05. My server has version 1.06.

I found the answer elsewhere. I had to disable my printer port. Very strange. But then all interrupts went away.
PartybananAsked:
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Kyle SchroederConnect With a Mentor Endpoint EngineerCommented:
See this MSKB article (I would provide a direct microsoft.com link but I can't get there at the moment for some reason): Q252867

There is a tool called the Interrupt-Affinity Filter.  Here's the summary from the article:

SUMMARY
=======
 
Binding of device interrupts to particular processors on multiprocessor
computers is a useful technique to maximize performance, scaling, and
partitioning of large computers. Interrupt-Affinity Filter (IntFiltr) is an
interrupt-binding tool that permits you to establish affinity for device
processors on multiprocessor computers. IntFiltr uses Plug and Play features of
Windows 2000 and provides a Graphical User Interface (GUI) to permit interrupt
binding. This article describes how to install and use IntFiltr to permit a user
to change the Central Processing Unit (CPU) on a single computer.
---------------------------
Perhaps this will help you???

-dog*
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Kyle SchroederEndpoint EngineerCommented:
Have you installed ServicePack 2 and other WindowsUpdate patches?  Assuming you are running 2000 Server or Advanced server and not Professional...

Check this link:
http://www.pc.ibm.com/qtechinfo/MIGR-4PAU4F.html?lang=en_US
There are some notes about installing a certified RAID driver before the ServicePack.
Or this one regarding Advanced Server:
http://www.pc.ibm.com/qtechinfo/MIGR-4FJPZ7.html?lang=en_US

Back with more soon...

-dog*
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magarityCommented:
Use the task manager's ability to list CPU use per thread to see what program/process is using this time.  Get task-man going, hit 'view' and then 'select columns' (or similiar, sorry I'm on a Win98 machine at the library right now and can't check the exact sequence).  In the select views is an option for 'entire process tree' or somesuch...  it will show daughter processes that aren't always listed in the default task-man view.
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PartybananAuthor Commented:
Wow!

Thanks for all comments.

Unfortunately I've already looked into these things. There is no process that is taking up the CPU time. It's interrupts that take all the CPU time.

I've installed SP2 for Windows and all other updates. The motherboard BIOS is version 1.06 (latest version) and the ServeRAID (with all components) is version 4.84 (latest version). Updated ServeRAID after installing SP2 so they haven't been overwritten. I haven't set interrupts manually though, but there are no conflicts reported.  

Still looking for more ideas...

I'll try to set IRQ manually and see if it helps.

Thank you all!
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PiriCommented:
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:
Accept dogztar comment as asnwer
Please leave any comments here within the next seven days.
 
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
 
Piri
EE Cleanup Volunteer
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PartybananAuthor Commented:
I found the solution to my problem some time ago.
The solution was to disable the LPT port in Windows 2000. I have no idea why it helped but probably it was issuing interrupts like mad.
Possibly dogztar's solution would have helped if I hadn't already solved it myself so I accept that as answer.
There should really be someway to withdraw a question if you solve it yourself.

Thanks everybody for all ideas!
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Kyle SchroederEndpoint EngineerCommented:
Partybanan:
Glad you were able to resolve your problem.  And just FYI, you can "withdraw" a question by posting a request in Community Support to have your points refunded.  The content of the question will be left intact in case someone else has the same problem in the future.

-dog*
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