From owner-freebsd-performance@FreeBSD.ORG Sat Feb 17 08:53:13 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 1F9C916A473 for ; Sat, 17 Feb 2007 08:53:13 +0000 (UTC) (envelope-from garcol@postino.it) Received: from herman.elitel.it (herman.elitel.it [212.34.224.134]) by mx1.freebsd.org (Postfix) with SMTP id 8455B13C4BC for ; Sat, 17 Feb 2007 08:53:12 +0000 (UTC) (envelope-from garcol@postino.it) Received: (qmail 21244 invoked by uid 89); 17 Feb 2007 08:53:06 -0000 Received: from unknown (HELO elitel) (212.34.245.29) by herman.elitel.it with SMTP; 17 Feb 2007 08:53:06 -0000 Message-ID: <002801c75271$0afa5af0$1df522d4@elitel> From: To: Date: Sat, 17 Feb 2007 09:52:53 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.5 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 08:53:13 -0000 See kern/83406: [smp] em/bge drivers: severe performance loss under SMP sysctl machdep.cpu_idle_hlt=3D0 (sysctl machdep.hyperthreading_allowed=3D1) 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