Just wondering why seti only reports my core 2 duo as only having one cpu and consequently only works on one work unit at a time. My P4 at work was happy to work on two units at a time until I changed the perferences to force it to use only one cpu but it was recognised as having two cpu's... I presume this is because the core duo does not have HTT. But I would have expected a core 2 duo to be recognised as having two cpus and work on two units at a time.

Just wondering why seti only reports my core 2 duo as only having one cpu and consequently only works on one work unit at a time. My P4 at work was happy to work on two units at a time until I changed the perferences to force it to use only one cpu but it was recognised as having two cpu's... I presume this is because the core duo does not have HTT. But I would have expected a core 2 duo to be recognised as having two cpus and work on two units at a time.

You need to edit your preferences.

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You said you changed your preferences to use only one CPU. Did you ever change it back to two CPUs? If you tell SETI to only use one, that's all it will use on all machines.

Does Windows recognize two CPUs in Task Manager?

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The Core duo is on the 'home' setting which allows multiple cpu's. Device manager shows two proccesors but task manager seems to show only one (I think). Screenshots below. The cpu is overclocked but is absolutely rock solid and has never locked up. If there are no answers here then I'll take it back to stock speeds to see if that makes a difference.

The Core duo is on the 'home' setting which allows multiple cpu's. Device manager shows two proccesors but task manager seems to show only one (I think). Screenshots below. The cpu is overclocked but is absolutely rock solid and has never locked up. If there are no answers here then I'll take it back to stock speeds to see if that makes a difference.

Is the second core disabled through power saving software? Or do you have the proper multi-processor HAL installed for Windows?

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I thought even XP home included support for dual cores natively????

I thought even XP home included support for dual cores natively????

It does come with multi-core chip support, but if you originally installed Windows on a single-core chip and later upgraded, the original single-cpu HAL will still be used until upgraded (this should be done automatically, but sometimes it doesn't do so).

To verify, in Device Manager, under Computer, does it show ACPI Multiprocessor PC or ACPI Uniprocessor PC?

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I thought even XP home included support for dual cores natively????

It does come with multi-core chip support, but if you originally installed Windows on a single-core chip and later upgraded, the original single-cpu HAL will still be used until upgraded (this should be done automatically, but sometimes it doesn't do so).

To verify, in Device Manager, under Computer, does it show ACPI Multiprocessor PC or ACPI Uniprocessor PC?

I'm not trying to be difficult but it shows neither. It just sayes Advanced Configuration and Power Interface (ACPI) PC

The PC was built from scatch btw with the Core Duo chip....

I'm not trying to be difficult but it shows neither. It just sayes Advanced Configuration and Power Interface (ACPI) PC

Then the multi-CPU HAL was not installed, which is odd if it was originally set up on the Core 2 chip. Was it set up with XP then later upgraded to SP2? That will sometimes cause XP to not support multi-cores, as I believe it wasn't properly added until SP2, so the original setup routine would have installed the single-CPU HAL.

Do you have an option in your BIOS for 'MIPS'? If so, is it set to v1.1 or v1.4? This might also make a difference. Or an option to choose PIC or APIC? APIC would be the better choice, but typically should be selected before installing your OS (though I've changed this before after OS installation without issue - just don't do it in reverse from APIC to PIC).

Otherwise, you'll have to install the multi-core/CPU HAL manually. I'm trying to find the link for you to the patch...

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Did you check the "view" menu in task manager.
You have to tell it to display individual diagrams per CPU.


Regards Hans

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Did you check the "view" menu in task manager.
You have to tell it to display individual diagrams per CPU.


Regards Hans

Good catch. That's true, but it wouldn't prevent BOINC from using both cores. My guess is that Windows does not recognize both cores properly.

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OK, installing multi-CPU HAL might not be that hard, but here's the steps:

1) Open Device Manager
2) Click on the "+" next to Computer
3) Double click on ACPI PC
4) Click on the Driver tab
5) Click on Update Driver
6) optional (I did not verify this would work) you can have Windows attempt to automatically detect new hardware
7) Otherwise select "No" in detecting new hardware
8) Select "Install from a list or specific location"
9) Select "Don't search. I will choose the driver to install"
10) Select "ACPI Multiprocessor PC"

Windows should take care of the rest.

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Did you check the "view" menu in task manager.
You have to tell it to display individual diagrams per CPU.


Regards Hans

Already looked at that and the option is greyed out...

I installed XP home of a brand new OEM disk about 3 weeks ago.

OK, installing multi-CPU HAL might not be that hard, but here's the steps:

1) Open Device Manager
2) Click on the "+" next to Computer
3) Double click on ACPI PC
4) Click on the Driver tab
5) Click on Update Driver
6) optional (I did not verify this would work) you can have Windows attempt to automatically detect new hardware
7) Otherwise select "No" in detecting new hardware
8) Select "Install from a list or specific location"
9) Select "Don't search. I will choose the driver to install"
10) Select "ACPI Multiprocessor PC"

Windows should take care of the rest.

Just tried it (both methods) it does not give me the option to select a multiprocessor PC...

Just set the CPU to stock speed no difference. The Bios MPS setting is currently set to version 1.4. From some quick research this makes no difference since the ACPI spec. replaces the MPS spec.

Just set the CPU to stock speed no difference. The Bios MPS setting is currently set to version 1.4. From some quick research this makes no difference since the ACPI spec. replaces the MPS spec.

The confusing thing is that is shows two CPUs in Device Manager, but all information points to the fact that the multi-CPU HAL isn't installed.

Can you try one more verification process, just to be certain? Can you run CPU-Z and see how many cores it says are installed? Also, can you check to see if APIC is enabled in your BIOS too?

For more information about the APIC setting:
Here
and here

According to Microsoft's documents, APIC does make a difference in multi-cpu/core systems.

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I need to go to bed. It's almost 2:20AM here. If you haven't found a solution by the time I wake up tomorrow, I will pick up where we left off then.

Good night.

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I need to go to bed. It's almost 2:20AM here. If you haven't found a solution by the time I wake up tomorrow, I will pick up where we left off then.

Good night.

I need to go to bed. It's almost 2:20AM here. If you haven't found a solution by the time I wake up tomorrow, I will pick up where we left off then.

Good night.

Sleep well :) CPU-Z shows only 1 core??? I'll do some research and see what I can find out.