From owner-freebsd-questions@FreeBSD.ORG  Tue Nov 21 19:43:43 2006
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Date: Tue, 21 Nov 2006 14:43:31 -0500
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Thread-Topic: Disabled HTT in the kernel but not the BIOS?
Thread-Index: AccNaldbSrlXnmN1QqiANlGJYyiWHQAOufFg
From: "Jay Gordon" <jgordon@datapipe.com>
To: "Kirk Strauser" <kirk@strauser.com>,
	<freebsd-questions@freebsd.org>
Cc: 
Subject: RE: Disabled HTT in the kernel but not the BIOS?
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This is fine.  It still shows it even though it will only load 0 and 2.

If you are really worried, turn it off in bios.

Jay Gordon
Unix Systems Administrator
DataPipe Managed Hosting Services
- What It Means To Be Sure -=20
jgordon@datapipe.com  |  http://www.datapipe.com
Tel: 201.792.1918 x2402 |  Fax: 201-792-3090


-----Original Message-----
From: owner-freebsd-questions@freebsd.org
[mailto:owner-freebsd-questions@freebsd.org] On Behalf Of Kirk Strauser
Sent: Tuesday, November 21, 2006 7:40 AM
To: freebsd-questions@freebsd.org
Subject: Disabled HTT in the kernel but not the BIOS?

I have a dual Xeon/HTT server that I run with
machdep.hyperthreading_allowed=20
set to 0.  At boot, it detects 4 CPUs:

  FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
   cpu0 (BSP): APIC ID:  0
   cpu1 (AP): APIC ID:  1
   cpu2 (AP): APIC ID:  6
   cpu3 (AP): APIC ID:  7

but top confirms that only processors 0 and 2 are actually running.  So,
other=20
than top being unwilling to report more than 50% CPU load, are there any

other problems with running like this, such as the cache being split for
the=20
benefit of the HTT that I'm not enabling?  I can live with the cosmetic=20
glitch, but don't want to take a pointless performance hit.
--=20
Kirk Strauser