Message-ID: <20BF5713E14D5B48AA289F72BD372D68C1E9EC@AUSXMPC122.aus.amer.dell.com>
From: Matt_Domsch@Dell.com
To: driver@jpl.nasa.gov, root@chaos.analogic.com
cc: mcuss@cdlsystems.com, linux-kernel@vger.kernel.org
Subject: RE: Kernel reports 4 CPUS instead of 2...
Date: Wed, 16 Oct 2002 20:02:42 -0500
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> My /proc/cpuinfo says I have ht CPU's... but i only see 2 
> CPU's... (Yet 
> I have 2 1.7Ghz XEONs in the box so shouldn't I see 4?)

1.8GHz Xeon and above have HyperThreading implemented.  Below that
processors may show the 'ht' bit in /proc/cpuinfo, but don't actually have
HT implemented on the chip.  There's a secondary call you have to make to
get the count of actual logical processors implemented - the 'ht' bit means
that the architecture is ht-capable. :-)

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

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