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I might buy a laptop in the near future with a P4 3GHz CPU with hyperthreading. If I enabled hyperthreading (I presume you have to do that in the BIOS) and installed linux on this laptop what sort of kernel should I install? The SMP kernel? Will a distro, such as Mandrake, automatically detect the hyperthreading, see my system as having 2 CPUs, and install the SMP kernel?
Hyperthreading requires an SMP kernel. And as far as I can recall - this may just be my memory making up things - if you have problems with the install with hyperthreading enabled, turn it off in the BIOS, install without hyperthreading and recompile the kernel after install with SMP support.
Originally posted by Obi Perrin Hyperthreading requires an SMP kernel. And as far as I can recall - this may just be my memory making up things - if you have problems with the install with hyperthreading enabled, turn it off in the BIOS, install without hyperthreading and recompile the kernel after install with SMP support.
If I wanted to dual boot between WinXP and Linux is it possible to turn on the hyperthreading in the BIOS when I wish to boot up XP; and turn it off when I wish to boot Linux?
Why would you want to turn it off to boot Linux? Recompiling the kernel (if it's even necessary, I haven't been lucky enough to test an installation with a hyperthreading CPU, therefore am unaware of Mandrake's ability to detect it) is a half hour job. For such a vital part of the system, it's really rather easy to compile. If you need a guide to it there's one at http://tldp.org.
In other words, no, I don't know of anything that would let you change BIOS settings on each reboot - other than changing them yourself. Any such solution would be a kludge anyway, it's best to try to get hyperthreading working with Linux first instead of searching for a workaround now
Think of it like this - as long as you backup your old version, and don't overwrite it's entry in your bootloader, you're free to delete any botched up kernel you like.
It took me 3 attempts to get my first working kernel, but in the end, it's worth it. I just kept making newbie mistakes like choosing ext3 as a module instead being built in. Follow the guide at tldp and you should be fine.
Yeah, I just purchased the P4P800 mainboard with the Pentium 4 2.4 GHz (hyperthreading). Redhat detected ... and installed the smp kernel from the start. And I've had no problems yet. So I would imagine that Mandrake...Debian...etc should do the same (or at least in the very near future).