Red Hat Enterprise Linux 5 Administration Unleashed

202CHAPTER 864-Bit, Multi-Core, and Hyper-Threading Technology Processors2. Press the E key to add a kernel option to the kernel selected.3. At the end of the line, add a space and then the noht kernel option.4. Press Enter to return to the GRUB boot menu.5. Press the B key to boot the system.Hyper-Threading can be disabled for all subsequent boots if the kernel option is added tothe GRUB configuration file. As root, open the /etc/grub.conf file and find the kernelstanza for which you want to disable Hyper-Threading. Find the kernel line for the stanza,add a space to the end, and add the noht kernel option as shown in Listing 8.3.LISTING 8.3Disabling Hyper-Threading with GRUBdefault=0timeout=15splashimage=(hd0,0)/boot/grub/splash.xpm.gzhiddenmenutitle Red Hat Enterprise Linux (2.6.16-1.2133)root (hd0,0)kernel /boot/vmlinuz-2.6.16-1.2133 ro root=LABEL=/ rhgb quiet nohtinitrd /boot/initrd-2.6.16-1.2133.imgSummaryThis chapter explained what to look for when using Red Hat Enterprise Linux on 64-bitand multi-core systems as well as systems with Hyper-Threading Technology. Install RedHat Enterprise Linux on these systems as you would for any other system. For the 64-bitsystem, be sure to install the 64-bit version of the operating system. For a multi-coresystem, the number of processor cores is detected, and the appropriate kernel is installed.