From owner-freebsd-stable@FreeBSD.ORG Tue Apr 20 06:48:29 2004 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 193E916A4CF for ; Tue, 20 Apr 2004 06:48:29 -0700 (PDT) Received: from mail.errors.firstcallgroup.co.uk (mail.errors.firstcallgroup.co.uk [213.167.69.198]) by mx1.FreeBSD.org (Postfix) with ESMTP id B7F9C43D31 for ; Tue, 20 Apr 2004 06:48:28 -0700 (PDT) (envelope-from petefrench@keithprowse.com) Received: from smaug.rattatosk ([172.16.1.8]) by mail.errors.firstcallgroup.co.uk with esmtp (Exim 4.22) id 1BFvbu-000CGd-Mw; Tue, 20 Apr 2004 14:48:26 +0100 Received: from [172.16.1.6] (helo=dilbert.firstcallgroup.co.uk) by smaug.rattatosk with esmtp (Exim 4.22) id 1BFvbu-0009yE-Ep; Tue, 20 Apr 2004 14:48:26 +0100 Received: from petefrench by dilbert.firstcallgroup.co.uk with local (Exim 4.30; FreeBSD) id 1BFvbu-0000iO-EQ; Tue, 20 Apr 2004 14:48:26 +0100 To: altares@e-card.bg, kris@obsecurity.org In-Reply-To: <20040420073837.GS32493@e-card.bg> Message-Id: From: Pete French Date: Tue, 20 Apr 2004 14:48:26 +0100 cc: stable@freebsd.org Subject: Re: HTT and SMP question X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Apr 2004 13:48:29 -0000 > Would you please point out some cases when HTT with machdep.hlt_logical_cpus=0 > causes worse performance than machdep.hlt_logical_cpus=1? Doing a large 'make' does it for me - small difference, but measurable. I get the best poerformance by compiling out SMP alltogether though. As my machine spends most of its time doing 'make' then for me it's worth removing it entirely (aside from the fact that my machine isnt stable under HTT) -pcf.