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Old 04-06-2005, 06:46 AM   #1
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Registered: Nov 2004
Location: Sydney, Australia
Distribution: Formerly RH, Fedora, now Ubuntu
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Hyperthreading - problems on dual Xeon VME board


How can I get Hyperthreading working on my dual Xeon board when the BIOS does not contain the ACPI support module?

Is there a magic set of kernel options that will get the kernel to start the Hyperthreaded CPUs?


I am having a problem with a dual (physical) Xeon VME single board (from GMS model V269)) getting hyperthreading up and going on the CPUs. Two physical CPUs are recognised but not the

I have Fedora Core 3 installed with the SMP kernel now upgraded (rpm) to 2.6.10

The board manufacturer has not included the ACPI module in the BIOS (AMIBIOS8) for their own reasons. GMS position is that this is only a power management function and users of this board would not require power manangement.

The BIOS Northbridge (Serverworks GC-LE) support does have a switch option to enable hyperthreading, this is enabled.

As I understand ACPI the BIOS passes configuration information about the CPUs to the Linux Kernel which then know how to initialise the Hyperthreading CPUs.

Apparently Windows does not require this information from the Kernel to run Hyperthreading so naturally GMS (the board manufacturer) is not willing to spend the effort to get ht on Linux sorted out.

On booting the Linux dmesg shows the message "ACPI: Unable to locate RSDP" which I interpret to mean the Kernel is unable to find the resource information table which should have been setup by the BIOS.

I have tried the kernel parameter acpi=ht but this did nothing to activate the ht activity.

Does this make sense?
Hoping someone can give me some clues.

Old 07-27-2005, 04:16 PM   #2
Registered: Jun 2005
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did you ever happen to figure this one out. I am having a similar problem. i get the acpi message. I have noticed that my system resources sometimes indicates two processors and sometimes four (depending on kernel). Does this mean hyperthreading is off/on respectively and is it related to the ACPI error?


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