From owner-freebsd-current@FreeBSD.ORG Wed Sep 14 20:21:38 2011 Return-Path: Delivered-To: freebsd-current@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 8E751106564A for ; Wed, 14 Sep 2011 20:21:38 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140]) by mx1.freebsd.org (Postfix) with ESMTP id D82888FC13 for ; Wed, 14 Sep 2011 20:21:37 +0000 (UTC) Received: from porto.starpoint.kiev.ua (porto-e.starpoint.kiev.ua [212.40.38.100]) by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id XAA00707; Wed, 14 Sep 2011 23:21:34 +0300 (EEST) (envelope-from avg@FreeBSD.org) Received: from localhost ([127.0.0.1]) by porto.starpoint.kiev.ua with esmtp (Exim 4.34 (FreeBSD)) id 1R3vxe-0001eo-Cn; Wed, 14 Sep 2011 23:21:34 +0300 Message-ID: <4E710CCD.6020509@FreeBSD.org> Date: Wed, 14 Sep 2011 23:21:33 +0300 From: Andriy Gapon User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:6.0.2) Gecko/20110907 Thunderbird/6.0.2 MIME-Version: 1.0 To: Andrew Boyer References: <2C3C4570-C5F9-42F5-AA81-900151590DB8@averesystems.com> <4E7106DE.40707@FreeBSD.org> <70B018CB-4658-45DD-929E-A953B299E737@averesystems.com> In-Reply-To: <70B018CB-4658-45DD-929E-A953B299E737@averesystems.com> X-Enigmail-Version: undefined Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: freebsd-current@FreeBSD.org Subject: Re: Identification of HTT cores on newer (CPUID leaf 11) Intel processors X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Sep 2011 20:21:38 -0000 on 14/09/2011 23:02 Andrew Boyer said the following: > Actually, it's not useless. If you don't set it to something other than zero > the machdep.hyperthreading_allowed tunable doesn't do anything, since it > can't tell which CPUs are actually HTT. Ah, you are right. That works correctly with my (not yet published) patch that doesn't make distinction between HTT flavors. But in the main tree "SMT" != HTT. -- Andriy Gapon