[WBEL-users] Re: Hyperthreading not enabled in WB kernels?

[Keith Morse]

On Wed, 28 Apr 2004 Vincent.Raffensberger@dtn.com wrote:

> While testing whitebox I noticed that hyperthreading doesn't appear to be 
> enabled in the kernel. 
> This system is a dual Xeon with HT enabled and showing in the BIOS.
> This same box has run RH8.0 and Fedora Core1 and they both showed four 
> "processors" and "siblings: 2" in /proc/cpuinfo.
> As recommended elsewhere, I tried appending "apcismp=force" to the kernel, 
> but that didn't change anything.
> 
> Are there any other users seeing the same type of thing?
> 
> Here's some relevant info from the system:
> [root@wbel3 root]# uname -a
> Linux wbel3 2.4.21-9.0.3.ELsmp #1 SMP Sat Apr 24 21:45:44 EDT 2004 i686 
                                    ^^^
                                    ^^^
I think the key here is that you are using a SMP kernel.  IIRC that is how 
the HT part is enabled.