From: "Brian Jackson" <brian-kernel-list@mdrx.com>
To: "Scott Robert Ladd" <scott@coyotegulch.com>
Cc: "Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: Re: /proc/cpuinfo and hyperthreading
Date: Mon, 16 Dec 2002 07:54:53 -0600 [thread overview]
Message-ID: <20021216135453.3823.qmail@escalade.vistahp.com> (raw)
In-Reply-To: <FKEAJLBKJCGBDJJIPJLJEEKMDLAA.scott@coyotegulch.com>
You could always boot once with nosmp and run some benchmarks and then
reboot (with smp) and run some more benchmarks, and see if there is a
difference.
--Brian Jackson
Scott Robert Ladd writes:
> Zwane Mwaikambo wrote:
>> It's ok.
>
> I'm not so sure.
>
> To get the most benefit from two logical CPUs, don't I need the kernel to
> operate as a 2-CPU SMP system?
>
> Windows XP initializes the system as SMP with two CPUs; when I run an OpenMP
> application under Windows, it reports two CPUs and a maximum of two threads.
> Under Linux,
>
> Linux SMP should initialize based on the number of logical CPUS, not the
> physical number of ships; thus, I should be seeing two CPUs in
> /proc/cpuinfo, not one.
>
> ..Scott
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> Please read the FAQ at http://www.tux.org/lkml/
next prev parent reply other threads:[~2002-12-16 13:43 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200212160004.gBG04g130091@hera.kernel.org>
2002-12-16 2:34 ` [XFS] add missing file xfs_iomap.c Anders Gustafsson
2002-12-16 3:58 ` /proc/cpuinfo and hyperthreading Scott Robert Ladd
2002-12-16 4:02 ` Robert Love
2002-12-16 4:13 ` Scott Robert Ladd
2002-12-16 6:28 ` Zwane Mwaikambo
2002-12-16 6:35 ` Zwane Mwaikambo
2002-12-16 13:38 ` Scott Robert Ladd
2002-12-16 13:54 ` Brian Jackson [this message]
2002-12-16 14:10 ` Richard B. Johnson
2002-12-16 14:56 ` Scott Robert Ladd
2002-12-16 15:11 ` Måns Rullgård
2002-12-16 15:44 ` HT Benchmarks (was: /proc/cpuinfo and hyperthreading) Scott Robert Ladd
2002-12-16 22:38 ` J.A. Magallon
2002-12-16 23:21 ` Scott Robert Ladd
2002-12-16 23:27 ` J.A. Magallon
2002-12-17 11:03 ` Denis Vlasenko
2002-12-17 20:44 ` H. Peter Anvin
2002-12-16 23:50 ` H. Peter Anvin
2002-12-17 19:27 ` Bill Davidsen
2002-12-16 15:52 ` /proc/cpuinfo and hyperthreading Andrew Theurer
2002-12-16 14:08 ` Dave Jones
2002-12-16 14:36 ` Scott Robert Ladd
2002-12-16 4:39 ` [XFS] add missing file xfs_iomap.c Linus Torvalds
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