From owner-svn-src-all@FreeBSD.ORG Wed Dec 4 10:54:24 2013 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 74107382; Wed, 4 Dec 2013 10:54:24 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 4639F169F; Wed, 4 Dec 2013 10:54:24 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.7/8.14.7) with ESMTP id rB4AsOhE077306; Wed, 4 Dec 2013 10:54:24 GMT (envelope-from mav@svn.freebsd.org) Received: (from mav@localhost) by svn.freebsd.org (8.14.7/8.14.7/Submit) id rB4AsOUJ077305; Wed, 4 Dec 2013 10:54:24 GMT (envelope-from mav@svn.freebsd.org) Message-Id: <201312041054.rB4AsOUJ077305@svn.freebsd.org> From: Alexander Motin Date: Wed, 4 Dec 2013 10:54:24 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r258918 - stable/10/release/doc/en_US.ISO8859-1/hardware X-SVN-Group: stable-10 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Dec 2013 10:54:24 -0000 Author: mav Date: Wed Dec 4 10:54:23 2013 New Revision: 258918 URL: http://svnweb.freebsd.org/changeset/base/258918 Log: MFC r258495: Update description of logical CPU handling in the latest releases and remove obsolete sysctl variable machdep.hlt_logical_cpus. Approved by: re (hrs) Modified: stable/10/release/doc/en_US.ISO8859-1/hardware/article.xml Directory Properties: stable/10/release/doc/ (props changed) Modified: stable/10/release/doc/en_US.ISO8859-1/hardware/article.xml ============================================================================== --- stable/10/release/doc/en_US.ISO8859-1/hardware/article.xml Wed Dec 4 09:58:50 2013 (r258917) +++ stable/10/release/doc/en_US.ISO8859-1/hardware/article.xml Wed Dec 4 10:54:23 2013 (r258918) @@ -177,16 +177,13 @@ bugs may generate some problems. Perusal of the archives of the &a.smp; may yield some clues. - &os; will take advantage of HyperThreading (HTT) support - on &intel; CPUs that support this feature. The - default &os; scheduler treats the logical processors the same - as additional physical processors; in other words, no attempt - is made to optimize scheduling decisions given the shared - resources between logical processors within the same CPU. - Because this naive scheduling can result in suboptimal - performance, under certain circumstances it may be useful to - disable the logical processors with the - machdep.hyperthreading_allowed tunable. + &os; will take advantage of SMT (Symmetric MultiThreading, + also known as HyperThreading on &intel; CPUs) on the supported + CPUs. The GENERIC kernel which is + installed by default will automatically detect the additional + logical processors. The default &os; scheduler recognizes + processor topology on the system and selects logical and + physical processors to obtain optimal performance. The &man.smp.4; manual page has more details. &os; will take advantage of Physical Address Extensions