From owner-freebsd-bugs@FreeBSD.ORG Mon Mar 13 15:30:36 2006 Return-Path: X-Original-To: freebsd-bugs@hub.freebsd.org Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 7ED6B16A476 for ; Mon, 13 Mar 2006 15:30:35 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21]) by mx1.FreeBSD.org (Postfix) with ESMTP id A7EB543D64 for ; Mon, 13 Mar 2006 15:30:16 +0000 (GMT) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (gnats@localhost [127.0.0.1]) by freefall.freebsd.org (8.13.4/8.13.4) with ESMTP id k2DFUGHK078280 for ; Mon, 13 Mar 2006 15:30:16 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.13.4/8.13.4/Submit) id k2DFUGQb078279; Mon, 13 Mar 2006 15:30:16 GMT (envelope-from gnats) Resent-Date: Mon, 13 Mar 2006 15:30:16 GMT Resent-Message-Id: <200603131530.k2DFUGQb078279@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-bugs@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, petefrench@ticketswitch.com Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id CD32C16A425 for ; Mon, 13 Mar 2006 15:23:05 +0000 (UTC) (envelope-from webadmin@ticketswitch.com) Received: from mail.errors.firstcallgroup.co.uk (mail.errors.firstcallgroup.co.uk [213.167.69.198]) by mx1.FreeBSD.org (Postfix) with ESMTP id 155C643D45 for ; Mon, 13 Mar 2006 15:23:05 +0000 (GMT) (envelope-from webadmin@ticketswitch.com) Received: from websvr01.rattatosk ([172.19.81.0]) by mail.errors.firstcallgroup.co.uk with esmtp (Exim 4.52 (FreeBSD)) id 1FIosx-000DMu-Kl for FreeBSD-gnats-submit@freebsd.org; Mon, 13 Mar 2006 15:23:03 +0000 Received: from webadmin by websvr01.rattatosk with local (Exim 4.52 (FreeBSD)) id 1FIosx-000P66-JI for FreeBSD-gnats-submit@freebsd.org; Mon, 13 Mar 2006 15:23:03 +0000 Message-Id: Date: Mon, 13 Mar 2006 15:23:03 +0000 From: petefrench@ticketswitch.com Sender: Web Administrator To: FreeBSD-gnats-submit@FreeBSD.org X-Send-Pr-Version: 3.113 Cc: Subject: kern/94410: Cannot disable hyperthreading if more than one phsyical processor exists X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: petefrench@ticketswitch.com List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 13 Mar 2006 15:30:36 -0000 >Number: 94410 >Category: kern >Synopsis: Cannot disable hyperthreading if more than one phsyical processor exists >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Mon Mar 13 15:30:16 GMT 2006 >Closed-Date: >Last-Modified: >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: >Unformatted: