How to turn hyperthreading off
 

Hello,

I have a Linux server running 2.4.9-e.34smp (i686) using hyperthreading (cat /proc/cpuinfo shows two CPUs with ht flags).

I would like to know how I can disable hyperthreading on that server. Some articles mention about change in BIOS settings - how to we do it on Linux? Should I recompile the kernel after it's done.

I apologize if the question is in the wrong forum.

Thanks
Khen

Just disable it in BIOS, then you will see only 1 cpu in /proc/cpuinfo

Thank you.

I have a dumb question: How do I change it in the bios. Is there a linux utility for it?

Thanks
khen

It's supported by your motherboard's BIOS, I don't know if there's such a linux utility so far.

Here is another way out of the RHEL 2.1 update 1 release notes.

- Addition of the "noht" boot option. When specified, hyperthreading
is disabled

Thanks a lot.

In which file can I set the "noht" option?

Khen

you can add it to grub in menu.lst at the end of the kernel line I believe.