Linux Disable Hyper Threading for Pentium 4 server GRUB boot loader

To disable hyperthreading on a Pentium 4 server with the GRUB boot loader, you can follow these steps:

1. Boot into the GRUB boot menu by pressing the appropriate key during boot (usually Esc or F12).

2. Use the arrow keys to select the kernel you want to boot, and then press 'e' to edit the boot options.

3. Locate the line that starts with "linux" or "kernel". This line specifies the kernel and its options.

4. Add the "noht" option to the end of the line. For example:

kernel /vmlinuz-2.6.32-504.3.3.el6.x86_64 ro root=/dev/mapper/vg_main-lv_root rd_NO_LUKS rd_NO_MD rd_LVM_LV=vg_main/lv_root SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8 noht

5. Press 'Ctrl+x' or 'F10' to boot with the modified options.

Note: Disabling hyperthreading may affect the performance of your server. You should consider the impact on your workload before making this change.