From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=45202 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Oghu5-0005JV-50 for qemu-devel@nongnu.org; Wed, 04 Aug 2010 13:37:22 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1Oghu3-0004eK-1h for qemu-devel@nongnu.org; Wed, 04 Aug 2010 13:37:20 -0400 Received: from mx1.redhat.com ([209.132.183.28]:52128) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1Oghu2-0004e3-Q9 for qemu-devel@nongnu.org; Wed, 04 Aug 2010 13:37:18 -0400 Message-ID: <4C59A547.7080206@redhat.com> Date: Wed, 04 Aug 2010 20:37:11 +0300 From: Avi Kivity MIME-Version: 1.0 Subject: Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35? References: <4C5847CD.9080107@codemonkey.ws> <4C5848C7.3090806@redhat.com> <4C584982.5000108@codemonkey.ws> <4C584B66.5070404@redhat.com> <4C5854F1.3000905@codemonkey.ws> <4C5858B2.9090801@redhat.com> <4C585F5B.5070502@codemonkey.ws> <4C58635B.7020407@redhat.com> <20100803191346.GA28523@amd.home.annexia.org> <4C586C6E.9030002@redhat.com> <20100803200057.GB28523@amd.home.annexia.org> <4C5880BC.2080802@codemonkey.ws> <4C588685.8070509@redhat.com> <4C588B7D.5040902@codemonkey.ws> <4C591D87.5020809@redhat.com> <4C5962DA.4090108@codemonkey.ws> <4C5998EB.2050804@redhat.com> <4C59996A.9010402@codemonkey.ws> <58DD5B14-F1A9-408C-982A-A29E0A7FACF2@suse.de> <4C599A27.9000602@codemonkey.ws> <4C599CE1.30501@redhat.com> <4C59A108.3090807@redhat.com> <4C59A31F.3020207@codemonkey.ws> In-Reply-To: <4C59A31F.3020207@codemonkey.ws> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Anthony Liguori Cc: Gleb Natapov , kvm@vger.kernel.org, "Richard W.M. Jones" , qemu-devel@nongnu.org, Alexander Graf , Paolo Bonzini On 08/04/2010 08:27 PM, Anthony Liguori wrote: > On 08/04/2010 12:19 PM, Avi Kivity wrote: >> On 08/04/2010 08:01 PM, Paolo Bonzini wrote: >>> >>> That's another story and I totally agree here, but not reusing >>> /dev/sd* is not intrinsic in the design of virtio-blk (and one thing >>> that Windows gets right; everything is SCSI, period). >>> >> >> I don't really get why everything must be SCSI. Everything must >> support read, write, a few other commands, and a large set of >> optional commands. But why map them all to SCSI? What's the magic? > > Because that's what real hardware with only a few rare exceptions. > I thought that IDE was emulated as SCSI even when it wasn't. But I guess now with SATA you're right. -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain.