From: "David Schwartz" <davids@webmaster.com>
To: "Artemio" <artemio@artemio.net>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: RE: SMP question
Date: Wed, 11 Jun 2003 13:14:53 -0700 [thread overview]
Message-ID: <MDEHLPKNGKAHNMBLJOLKMEJLDJAA.davids@webmaster.com> (raw)
In-Reply-To: <200306112252.40979.artemio@artemio.net>
> I'm building a hard real-time Linux (RTLinux) system on a 2x Xeon
> machine. If
> I compile and run a 2.4.18 kernel with SMP support, rtlinux hangs the
> machine. However, with SMP disabled, rtlinux and all it's hard-realtime
> applications runs okay.
> So, I have to deside between these two:
> - Run rtlinux and hard-realtime applications on a kernel without
> SMP support.
> How much performance will I loose this way? Is SMP *THAT* critical?
You will lose about half your CPU power.
> - Run all tasks in a usual way, no hard realtime, but with SMP support.
> What would you suggest?
If you don't install a kernel with SMP support, you might as well remove
one processor.
> Also, if I turn hyperthreading off, how will it influence the
> system with SMP
> support? Without SMP support?
In a system with more than one physical CPU, hyperthreading is not that big
of a performance boost.
DS
next prev parent reply other threads:[~2003-06-11 20:02 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-11 17:43 Artemio
2003-06-11 18:04 ` Tigran Aivazian
2003-06-11 19:38 ` Samuel Flory
2003-06-11 19:52 ` Artemio
2003-06-11 20:14 ` David Schwartz [this message]
2003-06-11 20:13 ` Artemio
2003-06-11 22:34 ` David Schwartz
2003-06-11 22:54 ` J.A. Magallon
2003-06-12 5:37 ` Artemio
2003-06-12 12:49 ` Matt Reppert
2003-06-12 17:25 ` Artemio
2003-06-12 14:02 ` Scott Robert Ladd
2003-06-12 20:59 ` J.A. Magallon
2003-06-11 21:25 ` Zwane Mwaikambo
[not found] <Pine.LNX.4.44.0306111838360.20310-100000@coffee.psychology.mcmaster.ca>
2003-06-12 5:42 ` Artemio
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