From owner-freebsd-bugs@FreeBSD.ORG Sun Apr 4 20:10:09 2010 Return-Path: Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 791CD1065673 for ; Sun, 4 Apr 2010 20:10:09 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:4f8:fff6::28]) by mx1.freebsd.org (Postfix) with ESMTP id 3B8A18FC0A for ; Sun, 4 Apr 2010 20:10:09 +0000 (UTC) Received: from freefall.freebsd.org (localhost [127.0.0.1]) by freefall.freebsd.org (8.14.4/8.14.4) with ESMTP id o34KA9nx018511 for ; Sun, 4 Apr 2010 20:10:09 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.14.4/8.14.4/Submit) id o34KA9TI018510; Sun, 4 Apr 2010 20:10:09 GMT (envelope-from gnats) Resent-Date: Sun, 4 Apr 2010 20:10:09 GMT Resent-Message-Id: <201004042010.o34KA9TI018510@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, Garrett Cooper Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 79C38106564A for ; Sun, 4 Apr 2010 20:06:07 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (www.freebsd.org [IPv6:2001:4f8:fff6::21]) by mx1.freebsd.org (Postfix) with ESMTP id 68C2C8FC12 for ; Sun, 4 Apr 2010 20:06:07 +0000 (UTC) Received: from www.freebsd.org (localhost [127.0.0.1]) by www.freebsd.org (8.14.3/8.14.3) with ESMTP id o34K67O6063348 for ; Sun, 4 Apr 2010 20:06:07 GMT (envelope-from nobody@www.freebsd.org) Received: (from nobody@localhost) by www.freebsd.org (8.14.3/8.14.3/Submit) id o34K67Uh063347; Sun, 4 Apr 2010 20:06:07 GMT (envelope-from nobody) Message-Id: <201004042006.o34K67Uh063347@www.freebsd.org> Date: Sun, 4 Apr 2010 20:06:07 GMT From: Garrett Cooper To: freebsd-gnats-submit@FreeBSD.org X-Send-Pr-Version: www-3.1 Cc: Subject: kern/145385: Logical processor cannot be disabled for some SMT-enabled Intel procs X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Apr 2010 20:10:09 -0000 >Number: 145385 >Category: kern >Synopsis: Logical processor cannot be disabled for some SMT-enabled Intel procs >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sun Apr 04 20:10:08 UTC 2010 >Closed-Date: >Last-Modified: >Originator: Garrett Cooper >Release: 9-CURRENT >Organization: Cisco Systems, Inc. >Environment: FreeBSD bayonetta.local 9.0-CURRENT FreeBSD 9.0-CURRENT #0 r205872M: Sat Apr 3 18:14:55 PDT 2010 root@bayonetta.local:/usr/obj/usr/src/sys/BAYONETTA amd64 >Description: As discussed here: http://forums.freebsd.org/showthread.php?t=12527 and here: http://www.mail-archive.com/freebsd-hackers@freebsd.org/msg70605.html logical CPUs cannot be disabled via machdep.hlt_logical_cpus tunable because it's incorrectly detecting that the SMT-enabled processor doesn't have hyperthreading cores (it's a Xeon X-series equivalent workstation processor, which has hyperthreading technology enabled). >How-To-Repeat: Boot with an X-series Xeon or Hyperthreading enabled Pentium processor chip and set `machdep.hlt_logical_cpus' to 1. The logical processors will not be disabled. >Fix: >Release-Note: >Audit-Trail: >Unformatted: