From owner-freebsd-stable@FreeBSD.ORG Tue Dec 25 14:10:03 2007 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 2845316A419 for ; Tue, 25 Dec 2007 14:10:03 +0000 (UTC) (envelope-from bv@bilver.wjv.com) Received: from wjv.com (fl-65-40-24-38.sta.embarqhsd.net [65.40.24.38]) by mx1.freebsd.org (Postfix) with ESMTP id DEFD013C4E1 for ; Tue, 25 Dec 2007 14:10:02 +0000 (UTC) (envelope-from bv@bilver.wjv.com) Received: from bilver.wjv.com (localhost.wjv.com [127.0.0.1]) by wjv.com (8.14.1/8.13.1) with ESMTP id lBPDbLe9025663 for ; Tue, 25 Dec 2007 08:37:21 -0500 (EST) (envelope-from bv@bilver.wjv.com) Received: (from bv@localhost) by bilver.wjv.com (8.14.1/8.13.1/Submit) id lBPDbG4Q025662 for freebsd-stable@freebsd.org; Tue, 25 Dec 2007 08:37:16 -0500 (EST) (envelope-from bv) Date: Tue, 25 Dec 2007 08:37:15 -0500 From: Bill Vermillion To: freebsd-stable@freebsd.org Message-ID: <20071225133715.GA25424@wjv.com> References: <20071225120015.6174B16A4D4@hub.freebsd.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20071225120015.6174B16A4D4@hub.freebsd.org> User-Agent: Mutt/1.4.2.2i Organization: W.J.Vermillion / Orlando - Winter Park ReplyTo: bv@wjv.com Subject: Re: SMP on FreeBSD 6.x and 7.0: Worth doing? X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: bv@wjv.com List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Dec 2007 14:10:03 -0000 It's Tue, Dec 25, 2007 at 12:00 . I'm in a small dim room with doors labeled "Dungeon" and "Forbidden". There is noise, the door marked Dungeon flies open and freebsd-stable-request@freebsd.org SHOUTS: > Date: Mon, 24 Dec 2007 08:49:36 -0700 > From: Brett Glass > Subject: Re: SMP on FreeBSD 6.x and 7.0: Worth doing? > To: Scott Long > Cc: stable@freebsd.org > At 07:14 AM 12/24/2007, Scott Long wrote: > >Brett, > >There could be several problems here: > >1. WITNESS, INVARIANTS, malloc debugging. Are any of these > >turned on for you? I don't recall if malloc debugging got > >turned off yet for the 7.0 snapshots. > I nuked debugging when I recompiled the kernel with SCHED_ULE. > >2. Disk subsystem. What kind of disk controller are you using? > >Not all drivers work well in FreeBSD. Are linux and freebsd > >using identical hardware? > They were. The drives are SATA. That still doesn't tell us if the drives are identical in throughput. Unless the drives are the same model/manufacturer, you should go to the manufacturers web-site for both drives, and look for the technical specs. THen you need to look for the speed of data transfer from the platter to the internal memory. I've seen [ in the past ] drives with lower revolutions per minute out-perform faster rotating drives because the slower drive had a better head design and could transfer data much faster. If this task is not up to you perhaps you could post the make/model number of the drives on both systems. Without knowing the sub-system capability you could be misleading yourself with other tests. Bill -- Bill Vermillion - bv @ wjv . com