From: Banai Zoltan <bazooka@emitel.hu>
To: Kelsey Hudson <khudson@compendium.us>
Cc: James Bourne <jbourne@mtroyal.ab.ca>,
Hugh Dickins <hugh@veritas.com>,
"Reed, Timothy A" <timothy.a.reed@lmco.com>,
linux-kernel@vger.kernel.org
Subject: Re: Hyperthreading
Date: Wed, 21 Aug 2002 23:55:03 +0200 [thread overview]
Message-ID: <20020821215503.GC1669@bazooka.saturnus.vein.hu> (raw)
In-Reply-To: <Pine.LNX.4.44.0208211414190.6621-100000@betelgeuse.compendium-tech.com>
On Wed, Aug 21, 2002 at 02:16:11PM -0700, Kelsey Hudson wrote:
> On Wed, 21 Aug 2002, James Bourne wrote:
>
> > On Wed, 21 Aug 2002, Hugh Dickins wrote:
> >
> > > You do need CONFIG_SMP and a processor capable of HyperThreading,
> > > i.e. Pentium 4 XEON; but CONFIG_MPENTIUM4 is not necessary for HT,
> > > just appropriate to that processor in other ways.
> >
> > I was under the impression that the only CPU capable of hyperthreading was
> > the P4 Xeon. Is this not correct? I don't know of any other CPUs that
> > have the ht feature.
>
> This is currently correct, although I believe Intel has plans to release a
> Hyperthreading-capable version of its desktop P4.
If this is correct, and there is not destop P4 capable of ht,
then what does mean the ht flag in cpuinfo?
$cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 1
model name : Intel(R) Pentium(R) 4 CPU 1.70GHz
stepping : 2
cpu MHz : 1694.907
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
bogomips : 3381.65
^^
>
> > Also, looking at setup.c it's hard to determine if CONFIG_SMP is
> > actually required, but it doesn't look like it...
>
> Of course it's required. How are you to take advantage of a "second CPU"
> if your scheduler only works on a uniprocessor machine?
>
> --
> Kelsey Hudson khudson@compendium.us
> Software Engineer/UNIX Systems Administrator
> Compendium Technologies, Inc (619) 725-0771
> ---------------------------------------------------------------------------
>
> -
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--
Banai Zoltan
next prev parent reply other threads:[~2002-08-21 22:24 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-21 11:32 Hyperthreading Reed, Timothy A
2002-08-21 13:48 ` Hyperthreading James Bourne
2002-08-21 17:33 ` Hyperthreading Hugh Dickins
2002-08-21 19:34 ` Hyperthreading James Bourne
2002-08-21 21:16 ` Hyperthreading Kelsey Hudson
2002-08-21 21:55 ` Banai Zoltan [this message]
2002-08-22 8:05 ` Hyperthreading venom
2002-08-26 19:00 ` Hyperthreading Kelsey Hudson
2002-08-22 8:00 ` Hyperthreading venom
2002-08-23 7:28 ` Hyperthreading Gilad Ben-Yossef
2002-08-23 8:10 ` Hyperthreading Hugh Dickins
2002-08-23 8:27 ` Hyperthreading Alan Cox
2002-08-23 8:12 ` Hyperthreading venom
-- strict thread matches above, loose matches on Subject: below --
2003-11-25 9:44 hyperthreading Gábor Lénárt
2003-11-25 9:48 ` hyperthreading Emiliano 'AlberT' Gabrielli
2003-11-25 10:05 ` hyperthreading Gábor Lénárt
2003-11-25 10:16 ` hyperthreading Arjan van de Ven
2003-11-25 10:32 ` hyperthreading Måns Rullgård
2003-11-25 10:45 ` hyperthreading Mikael Pettersson
2003-11-29 13:29 ` hyperthreading Bill Davidsen
2003-12-01 10:53 ` hyperthreading Emiliano 'AlberT' Gabrielli
2003-11-25 10:22 ` hyperthreading Karl Pitrich
2002-08-22 12:58 Hyperthreading Nir Soffer
2002-08-22 14:30 ` Hyperthreading Hugh Dickins
2002-08-22 9:15 Hyperthreading Marc Dietrich
2002-08-22 14:06 ` Hyperthreading Hugh Dickins
2002-08-22 14:36 ` Hyperthreading Marc Dietrich
2002-08-21 22:56 Hyperthreading Nakajima, Jun
2002-08-21 23:45 ` Hyperthreading Alan Cox
2002-04-18 1:52 Hyperthreading Holzrichter, Bruce
2002-04-17 20:34 Hyperthreading Holzrichter, Bruce
2002-04-17 22:48 ` Hyperthreading Martin J. Bligh
2002-04-18 1:21 ` Hyperthreading James Bourne
2002-04-17 20:02 SMP P4 APIC/interrupt balancing James Bourne
2002-04-17 21:10 ` Hyperthreading Martin J. Bligh
2002-04-17 20:15 ` Hyperthreading Robert Love
2002-04-17 20:23 ` Hyperthreading Dave Jones
2002-04-17 21:24 ` Hyperthreading Jeff V. Merkey
2002-04-17 20:25 ` Hyperthreading James Bourne
2002-04-17 21:26 ` Hyperthreading Jeff V. Merkey
2002-04-18 0:31 ` Hyperthreading Martin J. Bligh
2002-04-18 4:50 ` Hyperthreading Jeff V. Merkey
2002-04-17 22:12 ` Hyperthreading Alan Cox
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