From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:48761) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TTZYi-0003Kj-2O for qemu-devel@nongnu.org; Wed, 31 Oct 2012 10:46:27 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TTZYb-0006tO-HT for qemu-devel@nongnu.org; Wed, 31 Oct 2012 10:46:19 -0400 Received: from mail-pb0-f45.google.com ([209.85.160.45]:39133) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TTZYb-0006sj-AK for qemu-devel@nongnu.org; Wed, 31 Oct 2012 10:46:13 -0400 Received: by mail-pb0-f45.google.com with SMTP id rp2so995012pbb.4 for ; Wed, 31 Oct 2012 07:46:12 -0700 (PDT) Sender: Paolo Bonzini Message-ID: <509139AD.3000207@redhat.com> Date: Wed, 31 Oct 2012 15:46:05 +0100 From: Paolo Bonzini MIME-Version: 1.0 References: <87k3u82f7b.fsf@blackfin.pond.sub.org> <509000E8.9090703@redhat.com> <509008A3.5060908@redhat.com> <87txtbu0jg.fsf@codemonkey.ws> <878vamn3ok.fsf@blackfin.pond.sub.org> <87ehkelo38.fsf@blackfin.pond.sub.org> <50913870.2090607@redhat.com> <9D91D287-B449-49D9-BEEA-DDBF291EB9B9@suse.de> In-Reply-To: <9D91D287-B449-49D9-BEEA-DDBF291EB9B9@suse.de> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] On block interface types in general, IF_AHCI in particular List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Alexander Graf Cc: Kevin Wolf , Anthony Liguori , Jason Baron , Markus Armbruster , qemu-devel@nongnu.org, Gerd Hoffmann , Stefan Hajnoczi Il 31/10/2012 15:43, Alexander Graf ha scritto: > > On 31.10.2012, at 15:40, Paolo Bonzini wrote: > >> Il 31/10/2012 15:20, Markus Armbruster ha scritto: >>> One more thing: on a *major* upgrade, I'd rather deal with >>> immediately obvious breakage (does not boot) than rotten >>> performance. >>> >>> If we make "q35 with compat IDE" the default, we'll have to tell >>> users many, many times not to use the default :( >> >> Well, compat IDE is not on the same league as writethrough for bad >> performance, and virtio is anyway the better choice (and not >> available just with a different machine type). > > Are you seriously considering to carry that IDE legacy around simply > because we are too dumb to create working command line options? AHCI > gets you at least parallel disk access, so in most cases it's a lot > more sane than IDE. What's wrong with "-M q35" (which would go along with "-M piix" for absolute legacy)? I'm just saying that the default machine type ("-M pc") should boot Windows XP. Paolo