From owner-freebsd-hackers@FreeBSD.ORG Fri Jul 20 22:58:21 2012 Return-Path: Delivered-To: hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id D16B9106564A; Fri, 20 Jul 2012 22:58:21 +0000 (UTC) (envelope-from adrian.chadd@gmail.com) Received: from mail-pb0-f54.google.com (mail-pb0-f54.google.com [209.85.160.54]) by mx1.freebsd.org (Postfix) with ESMTP id 9EDCE8FC12; Fri, 20 Jul 2012 22:58:21 +0000 (UTC) Received: by pbbro2 with SMTP id ro2so7458113pbb.13 for ; Fri, 20 Jul 2012 15:58:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; bh=4p3X3iyTO7dEj0UtSW5FG0N4zUOfySdBxjG9FPZAZ58=; b=wrVKJ/c3s2veVzrGrjWqLMgyxnL+k6w+8QYNKQ+O1EBk1+qaTDnnzahlrNmKdhvZ7r CKm+ROYGK+KjvNY/7KDzCgH8wrq6a28eCBmXoT27UHIbjtPKmn0QWeFe69qPLUoMj8BZ ThcDCindCnQ7CTdGnZEmdtG4sGJSEZ8Ygl+3jT7HhnKPqAN1Jjdbz0+zAe53ArwRn6oO Sb6O7CZVklpRoAhyjmtRZLosI1s14wQxb808oeh7syjS26KxEyKKS7a100yV8Mvv8YKO V8jHkKYN4DGOUsrAN5eD25GwEFrE4+wESam5IbNoPkMDpjKiVoEeNl054+3oHgRexpii qwNA== MIME-Version: 1.0 Received: by 10.68.221.70 with SMTP id qc6mr17578645pbc.92.1342825101453; Fri, 20 Jul 2012 15:58:21 -0700 (PDT) Sender: adrian.chadd@gmail.com Received: by 10.68.191.138 with HTTP; Fri, 20 Jul 2012 15:58:21 -0700 (PDT) In-Reply-To: <5009DB2A.7070408@gentoo.org> References: <50085193.6030203@gentoo.org> <5009DB2A.7070408@gentoo.org> Date: Fri, 20 Jul 2012 15:58:21 -0700 X-Google-Sender-Auth: flW4Xf_yHKyD2G5cG3t8HXazizs Message-ID: From: Adrian Chadd To: Richard Yao Content-Type: text/plain; charset=ISO-8859-1 Cc: "hackers@FreeBSD.org" , current@freebsd.org Subject: Re: Awful FreeBSD 9 block IO performance in KVM X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Jul 2012 22:58:21 -0000 On 20 July 2012 15:26, Richard Yao wrote: > I am in the process of setting up a VM instance specifically for this. > While installing it, I noticed that qemu-kvm printed 'lsi_scsi: error: > ORDERED queue not implemented', which might be a clue as to why the > block device performance is bad. > > Also, I will try testing raw disk IO for Ivan after I have it setup. Thanks for setting this up. Setting up an easily reproducible environment is by far the biggest and most helpful step here. Adrian