From owner-freebsd-performance@FreeBSD.ORG Sat Feb 17 10:25:25 2007 Return-Path: X-Original-To: freebsd-performance@freebsd.org Delivered-To: freebsd-performance@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 3D45516A406 for ; Sat, 17 Feb 2007 10:25:25 +0000 (UTC) (envelope-from cheffo@FreeBSD-BG.org) Received: from blah.sun-fish.com (blah.sun-fish.com [217.18.249.150]) by mx1.freebsd.org (Postfix) with ESMTP id CAC2813C4B5 for ; Sat, 17 Feb 2007 10:25:24 +0000 (UTC) (envelope-from cheffo@FreeBSD-BG.org) Received: from blah.sun-fish.com (localhost [127.0.0.1]) by blah.sun-fish.com (Postfix) with ESMTP id 7005C1B10FCC; Sat, 17 Feb 2007 11:02:10 +0100 (CET) Received: from [192.168.3.125] (hater.cmotd.com [192.168.3.125]) by blah.sun-fish.com (Postfix) with ESMTP id 6CEDA1B10E55; Sat, 17 Feb 2007 11:02:10 +0100 (CET) Message-ID: <45D6D2A2.8090000@FreeBSD-BG.org> Date: Sat, 17 Feb 2007 12:02:10 +0200 From: Cheffo User-Agent: Thunderbird 1.5.0.9 (X11/20070122) MIME-Version: 1.0 To: garcol@postino.it References: <002801c75271$0afa5af0$1df522d4@elitel> In-Reply-To: <002801c75271$0afa5af0$1df522d4@elitel> Content-Type: text/plain; charset=windows-1251; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: ClamAV using ClamSMTP on BLAH Cc: freebsd-performance@freebsd.org Subject: Re: bizarre performance issues in 6.2 release X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Feb 2007 10:25:25 -0000 Hi all, garcol@postino.it wrote: > See kern/83406: [smp] em/bge drivers: severe performance loss under SMP > > > sysctl machdep.cpu_idle_hlt=0 > (sysctl machdep.hyperthreading_allowed=1) What actually do this ? (sysctl machdep.cpu_idle_hlt=0) From this PR (kern/83406) it seems that if you want full performance you need machdep.cpu_idle_hlt=0 and machdep.hyperthreading_allowed=0 or machdep.cpu_idle_hlt=1 and machdep.hyperthreading_allowed=1, and others combination drop performance .. Am I getting it right ? And if yes why by default HT is disable, but machdep.cpu_idle_hlt is enabled ? I'm little confused :) > > Regards > Alessandro > >> Try disabling hyperthreading on the 6.2-server. In some cases you get >> a moderate performance-increase, in most cases this setting is >> counter-productive. >> >> regards >> Claus > _______________________________________________ > freebsd-performance@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-performance > To unsubscribe, send any mail to "freebsd-performance-unsubscribe@freebsd.org" > > -- Best Wishes, Stefan Lambrev ICQ# 24134177