From owner-freebsd-performance@FreeBSD.ORG Sat Oct 23 00:30:38 2010 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E2A691065675 for ; Sat, 23 Oct 2010 00:30:38 +0000 (UTC) (envelope-from julian@freebsd.org) Received: from out-0.mx.aerioconnect.net (out-0-32.mx.aerioconnect.net [216.240.47.92]) by mx1.freebsd.org (Postfix) with ESMTP id C1FB08FC13 for ; Sat, 23 Oct 2010 00:30:38 +0000 (UTC) Received: from idiom.com (postfix@mx0.idiom.com [216.240.32.160]) by out-0.mx.aerioconnect.net (8.13.8/8.13.8) with ESMTP id o9N071al013172; Fri, 22 Oct 2010 17:07:01 -0700 X-Client-Authorized: MaGic Cook1e X-Client-Authorized: MaGic Cook1e Received: from julian-mac.elischer.org (h-67-100-89-137.snfccasy.static.covad.net [67.100.89.137]) by idiom.com (Postfix) with ESMTP id 88BCC2D6011; Fri, 22 Oct 2010 17:07:00 -0700 (PDT) Message-ID: <4CC22758.3040201@freebsd.org> Date: Fri, 22 Oct 2010 17:07:52 -0700 From: Julian Elischer User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.4; en-US; rv:1.9.2.11) Gecko/20101013 Thunderbird/3.1.5 MIME-Version: 1.0 To: David Wolfskill References: <20101020174854.GZ21226@albert.catwhisker.org> <4CBF8032.8000609@freebsd.org> <20101022231730.GP52404@albert.catwhisker.org> <20101022234817.GQ52404@albert.catwhisker.org> In-Reply-To: <20101022234817.GQ52404@albert.catwhisker.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.67 on 216.240.47.51 Cc: freebsd-performance@freebsd.org Subject: Re: Possible evidence of performance regression for 8.1-S (vs. 7.1) 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, 23 Oct 2010 00:30:39 -0000 On 10/22/10 4:48 PM, David Wolfskill wrote: > On Fri, Oct 22, 2010 at 04:17:30PM -0700, David Wolfskill wrote: >> On Wed, Oct 20, 2010 at 04:50:10PM -0700, Julian Elischer wrote: >>> ... >>> try the 7.x machine but running the 8.x kernel.. i.e. change nothing, >>> but boot the new kernel. >> I just started that test, to run over the weekend. >> ... > Moot point: the build fails. > that shouldn't happen maybe you need to set the uname vars so that the build THINKS it is on 7.x man 3 uname to find them. ENVIRONMENT UNAME_s If the environment variable UNAME_s is set, it will override the sysname member. UNAME_r If the environment variable UNAME_r is set, it will override the release member. UNAME_v If the environment variable UNAME_v is set, it will override the version member. UNAME_m If the environment variable UNAME_m is set, it will override the machine member. it's not unusual to have to do this when cross building with a different kernel. Running an 8.x kernel with the 7.x userland is a crucial part of debugging this. we really can't do much more until we have the results. If the build fails. it's either becasue the build detects the kernel rev (which we want to stop with this) or because of a bug in 8.1. It's supposed to be downwards compatible. > Peace, > david