Date: Tue, 12 Aug 2003 20:33:57 -0500 From: "Cagle, John (ISS-Houston)" <john.cagle@hp.com> To: "Scott M. Likens" <damm@fpsn.net>, "Brooks Davis" <brooks@one-eyed-alien.net> Cc: current@freebsd.org Subject: RE: Dual P4 2.4Ghz Xeon With Hyperthreading enabled... Message-ID: <C50AB9511EE59B49B2A503CB7AE1ABD10661097F@cceexc19.americas.cpqcorp.net>
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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@hp.com
Principal Member Technical Staff
Industry Standard Servers
Hewlett-Packard Company
> -----Original Message-----
> From: Scott M. Likens [mailto:damm@fpsn.net]=20
> Sent: Tuesday, August 12, 2003 8:19 PM
> To: Brooks Davis
> Cc: current@freebsd.org
> Subject: Re: Dual P4 2.4Ghz Xeon With Hyperthreading enabled...
>=20
>=20
> 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=20
> hyperthreading option
> > > in 4.8-RELEASE but I don't see one at ALL in 5.1?
> > >=20
> > > am I suddenly blind or do I need to cvsup to CURRENT to=20
> take proper
> > > advantage?
> >=20
> > 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.
> >=20
> > -- Brooks
>=20
> For clarification, setting this to 2 would mean 2 processor's to
> process?
>=20
> Thanks.
>=20
> --=20
> "I think we ought to be out there doing what we do best - making large
> holes in other people's countries." - George Carlin
>=20
>=20
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