From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([208.118.235.92]:51215)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <paolo.bonzini@gmail.com>) id 1TTbTF-0000rL-5t
	for qemu-devel@nongnu.org; Wed, 31 Oct 2012 12:48:49 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <paolo.bonzini@gmail.com>) id 1TTbT9-0001Kq-8J
	for qemu-devel@nongnu.org; Wed, 31 Oct 2012 12:48:49 -0400
Received: from mail-pb0-f45.google.com ([209.85.160.45]:41178)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <paolo.bonzini@gmail.com>) id 1TTbT9-0001KO-2B
	for qemu-devel@nongnu.org; Wed, 31 Oct 2012 12:48:43 -0400
Received: by mail-pb0-f45.google.com with SMTP id rp2so1069906pbb.4
	for <qemu-devel@nongnu.org>; Wed, 31 Oct 2012 09:48:41 -0700 (PDT)
Sender: Paolo Bonzini <paolo.bonzini@gmail.com>
Message-ID: <50915661.5060105@redhat.com>
Date: Wed, 31 Oct 2012 17:48:33 +0100
From: Paolo Bonzini <pbonzini@redhat.com>
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>
	<87objitywi.fsf@codemonkey.ws>
	<F213F13B-B266-4831-B326-903E482C6896@suse.de>
In-Reply-To: <F213F13B-B266-4831-B326-903E482C6896@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: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Alexander Graf <agraf@suse.de>
Cc: Kevin Wolf <kwolf@redhat.com>, Stefan Hajnoczi <stefanha@redhat.com>, Jason Baron <jbaron@redhat.com>, Markus Armbruster <armbru@redhat.com>, qemu-devel@nongnu.org, Gerd Hoffmann <kraxel@redhat.com>, Anthony Liguori <anthony@codemonkey.ws>

Il 31/10/2012 17:05, Alexander Graf ha scritto:
> That's the same reasoning that we used for cache=writethrough. It
> just plain sucks. Why can't we just drop Windows XP from the out of
> box experience and get everyone to at least 80% performance, rather
> than having a compatible, but completely useless VM.

And a few years later we did change the default.

1.2 uses writeback by default.

Really, the solution is a proper UI that says "XP? IDE is that
direction.  2k8? AHCI is that direction.  Linux? virtio be it" and does
it automatically for the user.

Paolo