Date: Fri, 19 Jul 2002 14:12:55 +0200 (CEST)
From: venom@sns.it
To: Robert Sinko <RSinko@island.com>
cc: "'Hubbard, Dwight'" <DHubbard@midamerican.com>, <Matt_Domsch@Dell.com>,
       <linux-kernel@vger.kernel.org>
Subject: RE: Wrong CPU count
In-Reply-To: <628900C9F8A7D51188E000A0C9F3FDFA024FF09D@S-NY-EXCH01>
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yes, as bios option.

On my point of view it would be interesting to verify is hyperthreading is
really usefull or not.

Recently I am studying new Athlon XP architecture, and I am programming
to study Xeon as soon, and then to compare them, to decide to which
architecture I should refer for new servers. Point is that instrction unit
management is too different, while real word benchs are 50% pro Athlon,
50% pro Xeon depending on the applications (well, more or less) ...


On Thu, 18 Jul 2002, Robert Sinko wrote:

> Date: Thu, 18 Jul 2002 16:35:29 -0400
> From: Robert Sinko <RSinko@island.com>
> To: "'Hubbard, Dwight'" <DHubbard@midamerican.com>, Matt_Domsch@Dell.com,
>      linux-kernel@vger.kernel.org
> Subject: RE: Wrong CPU count
>
> That's interesting.  Can it be disabled?
>
> -----Original Message-----
> From: Hubbard, Dwight [mailto:DHubbard@midamerican.com]
> Sent: Thursday, July 18, 2002 4:30 PM
> To: Matt_Domsch@Dell.com; RSinko@island.com;
> linux-kernel@vger.kernel.org
> Subject: RE: Wrong CPU count
>
>
> And doubles the cost of licensing software that uses per cpu licensing while
> giving marginally better performance.
>
> -----Original Message-----
> From: Matt_Domsch@Dell.com [mailto:Matt_Domsch@Dell.com]
> Sent: Thursday, July 18, 2002 3:01 PM
> To: RSinko@island.com; linux-kernel@vger.kernel.org
> Subject: RE: Wrong CPU count
>
>
> > After upgrading  from kernel 2.4.7-10smp to 2.4.9-34smp using
> > the Red Hat
> > RPM downloaded from RH Network, the CPU count on the machine
> > reported by
> > dmesg and listed in /proc/cpuinfo was 4 rather than the actual 2.
> >
> > This has occured on all 4 Dell 2650's that I've installed
> > this patch on.  I
> > don't have any other mult-processor machines available to
> > test this with.
>
> Congratulations, you purchased a fine PowerEdge 2650 with processors which
> contain HyperThreading technology.  Each physical processor appears as two
> logical processors.  This behaviour is expected, and correct. :-)
>
> Thanks,
> Matt
>
> --
> Matt Domsch
> Sr. Software Engineer, Lead Engineer, Architect
> Dell Linux Solutions www.dell.com/linux
> Linux on Dell mailing lists @ http://lists.us.dell.com
> #1 US Linux Server provider for 2001 and Q1/2002! (IDC May 2002)
>
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