[Centos] SMP rock-solid?

Tue Jan 25 15:53:22 UTC 2005
Jens Vagelpohl <jens at dataflake.org>

On Jan 25, 2005, at 16:11, William Warren wrote:

> SMP in linux is rock solid..what is causing issues is hyper threading 
> which fakes a second cpu to try to keep it's excessivly long pipeline 
> full.  Get two p-3's or two athlon's or run the two p-4's without 
> hyper threading and smp will work just fine. Hyperthreading is a godod 
> idea that unfortunatly has to be used to patch an inefficient cpu 
> design.

For those who don't know, simply adding the keyword "noht" at the end 
of the "kernel" line on grub.conf will turn it off when you reboot. So 
you would end up with a kernel line like so:

kernel /vmlinuz-2.4.20-31.9.progeny.6smp ro root=LABEL=/ noht

(No, this is not a CentOS box ;)

I've been doing that on all HT-enabled boxes I have. HT is of doubtful 
use for server applications. If your server runs Windoze and you like 
using M$ Office apps on it, well, maybe you have some gain...


Jens Vagelpohl			jens at zetwork.com
Zetwork GmbH				http://www.zetwork.com/