Hyper-threading - need to ask

greg32 · Posted: Fri Jun 06, 2003 10:01 pm Post subject: Hyper-threading - need to ask

Hi,
using a 2.6c processor. Running the 2.5.70 kernel. This is my first hyperthreaded chip. Can someone please tell me if all I need to do is enable smp in the kernel? Will this enable hyperthreading, and control it? I have enabled smp in the kernel, but when I run TOP, I can't see any mention of two cpu's. How do I confirm that h/t has been enabled and is working????

regards Greg

ebrostig · Posted: Sat Jun 07, 2003 12:04 am Post subject:

Hmmm.
This is an HT enabled P4?
Have you enabled HT in your BIOS setup?
You need to enable SMP and APIC support.

Run dmesg after booting to see all the boot messages and it should indicate that it starts up cpu0 and cpu1.

Also do cat /proc/cpuinfo, this should show 2 cpu's

Erik
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idl · Posted: Sat Jun 07, 2003 12:45 am Post subject:

Then edit /etc/make.conf and change MAKEOPTS to -j3
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greg32 · Posted: Sat Jun 07, 2003 10:44 am Post subject:

Yeah, it is a h/threaded chip. All c class processors are h/t. It is definately enabled in the bios, and windows xp recognises it. In the kernel, you can not enable smp, and apic. If you enable smp, apic dissapears. I am currently running with the kernel smp enabled. I tried disabling smp, and enabling apic, but this made no difference. cat /proc/cpuinfo only shows the one cpu.
Looking at the output of dmesg, it shows that it only detects 1 processor. Strange!
what else could be the problem here???

regards Greg