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Date: Mon, 13 Mar 2006 15:23:03 +0000
From: petefrench@ticketswitch.com
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Cc:
Subject: Cannot disable hyperthreading if more than one phsyical processor exists
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>Number:         94410
>Category:       kern
>Synopsis:       Cannot disable hyperthreading if more than one physical processor exists
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    linimon
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Mar 13 15:30:16 GMT 2006
>Closed-Date:    Mon May 28 12:26:37 GMT 2007
>Last-Modified:  Mon May 28 12:26:37 GMT 2007
>Originator:     Web Administrator
>Release:        FreeBSD 6.0-RELEASE i386
>Organization:
Ticket Switch Ltd
>Environment:
System: FreeBSD websvr01.rattatosk 6.0-RELEASE FreeBSD 6.0-RELEASE #0: Wed Dec 28 21:55:17 GMT 2005 webadmin@turpentine.rattatosk:/usr/obj/usr/src/sys/RATTATOSK-SMP i386

	HP blade running 6.0-RELEASE

>Description:

	If an SMP kernel is run on a machine with more than one physical
	processor there seems to be no way to disable hyperthreading.
	The usual flags appear to set the masks correctly, but I am still
	seeing processes scheduled on 4 CPUs in 'top'. This machine
	only has two physical CPUs. In a machine with only one physical
	CPU then the behaviour works as expected.

>How-To-Repeat:

	Boot up 6.0 on a machine with more than one hyperthreading capabale
	processors installed, but with the flags turned off and observer
	that processes are still scheduled on all the hyperthreading processors.
>Fix:
>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->feedback 
State-Changed-By: linimon 
State-Changed-When: Sat May 26 05:57:29 UTC 2007 
State-Changed-Why:  
Is this still a problem with recent versions of FreeBSD? 


Responsible-Changed-From-To: freebsd-bugs->linimon 
Responsible-Changed-By: linimon 
Responsible-Changed-When: Sat May 26 05:57:29 UTC 2007 
Responsible-Changed-Why:  

http://www.freebsd.org/cgi/query-pr.cgi?pr=94410 
State-Changed-From-To: feedback->closed 
State-Changed-By: linimon 
State-Changed-When: Mon May 28 12:26:05 UTC 2007 
State-Changed-Why:  
Submitter no longer has the hardware to reproduce this.  If someone else 
is having this problem, we'll open another PR. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=94410 
>Unformatted:
