From owner-freebsd-questions@FreeBSD.ORG Fri Jun 29 15:51:49 2012 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id D8593106566B for ; Fri, 29 Jun 2012 15:51:49 +0000 (UTC) (envelope-from wojtek@wojtek.tensor.gdynia.pl) Received: from wojtek.tensor.gdynia.pl (wojtek.tensor.gdynia.pl [89.206.35.99]) by mx1.freebsd.org (Postfix) with ESMTP id 29A948FC14 for ; Fri, 29 Jun 2012 15:51:48 +0000 (UTC) Received: from wojtek.tensor.gdynia.pl (localhost [127.0.0.1]) by wojtek.tensor.gdynia.pl (8.14.5/8.14.5) with ESMTP id q5TFpjQR045182; Fri, 29 Jun 2012 17:51:45 +0200 (CEST) (envelope-from wojtek@wojtek.tensor.gdynia.pl) Received: from localhost (wojtek@localhost) by wojtek.tensor.gdynia.pl (8.14.5/8.14.5/Submit) with ESMTP id q5TFpjPD045179; Fri, 29 Jun 2012 17:51:45 +0200 (CEST) (envelope-from wojtek@wojtek.tensor.gdynia.pl) Date: Fri, 29 Jun 2012 17:51:44 +0200 (CEST) From: Wojciech Puchar To: Fred Morcos In-Reply-To: Message-ID: References: <4FED7815.10102@ulb.ac.be> User-Agent: Alpine 2.00 (BSF 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.2.7 (wojtek.tensor.gdynia.pl [127.0.0.1]); Fri, 29 Jun 2012 17:51:45 +0200 (CEST) Cc: Julien Cigar , freebsd-questions@freebsd.org Subject: Re: Anatomy of Perfomance tests X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 Jun 2012 15:51:49 -0000 >> _______________________________________________ >> freebsd-questions@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-questions >> To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" > > It would be very interesting to see the results of stress-testing > systems. I cannot think of a scenario that isn't possible with a > virtual machine. quite but not really. if tested OS does not force hard disk to commit writes at right time, as FreeBSD do, virtual machine will not catch all things. anyway abruptly stopping virtual machine is a good test. use LARGE memory for tested OS. Funny but this is the case when linux is actually worse as it could delay more writes and then issue them in any order.