RE: Dual P4 2.4Ghz Xeon With Hyperthreading enabled...

I think the valid settings are only 0 or 1, with the default being 1
which will disable all logical CPUs.  If you want to enable the extra
logical CPUS, then set it to 0 (zero).  They will come online
immediately.

--------------------------------
John Cagle     john.cagle_at_hp.com
Principal Member Technical Staff
   Industry Standard Servers
    Hewlett-Packard Company

> -----Original Message-----
> From: Scott M. Likens [mailto:damm_at_fpsn.net] 
> Sent: Tuesday, August 12, 2003 8:19 PM
> To: Brooks Davis
> Cc: current_at_freebsd.org
> Subject: Re: Dual P4 2.4Ghz Xeon With Hyperthreading enabled...
> 
> 
> On Tue, 2003-08-12 at 15:41, Brooks Davis wrote:
> > On Tue, Aug 12, 2003 at 03:38:29PM -0700, Scott M. Likens wrote:
> > > Well friend of mine just landed a Dual P4 2.4Ghz Xeon with
> > > Hyperthreading Enabled, and yet I know there's a 
> hyperthreading option
> > > in 4.8-RELEASE but I don't see one at ALL in 5.1?
> > > 
> > > am I suddenly blind or do I need to cvsup to CURRENT to 
> take proper
> > > advantage?
> > 
> > There is no option in current.  Instead, you use the sysctl
> > machdep.hlt_logical_cpus to indicate if you want to use the logical
> > cpus.
> > 
> > -- Brooks
> 
> For clarification, setting this to 2 would mean 2 processor's to
> process?
> 
> Thanks.
> 
> -- 
> "I think we ought to be out there doing what we do best - making large
> holes in other people's countries." - George Carlin
> 
>