From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45916) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aqS5G-0002d9-54 for qemu-devel@nongnu.org; Wed, 13 Apr 2016 17:12:23 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aqS5B-0002T6-5u for qemu-devel@nongnu.org; Wed, 13 Apr 2016 17:12:22 -0400 Received: from mail-io0-x22e.google.com ([2607:f8b0:4001:c06::22e]:34919) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aqS5B-0002Sz-0r for qemu-devel@nongnu.org; Wed, 13 Apr 2016 17:12:17 -0400 Received: by mail-io0-x22e.google.com with SMTP id g185so84804847ioa.2 for ; Wed, 13 Apr 2016 14:12:17 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Huaicheng Li In-Reply-To: <570E8ADD.2010207@redhat.com> Date: Wed, 13 Apr 2016 16:12:13 -0500 Content-Transfer-Encoding: quoted-printable Message-Id: References: <20160314014248.GA2112@ad.usersys.redhat.com> <0205A5D4-9FC7-436C-B124-D0D0D3FD1A51@gmail.com> <570E8ADD.2010207@redhat.com> Subject: Re: [Qemu-devel] about correctness of IDE emulation List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: John Snow Cc: qemu-devel@nongnu.org, Stefan Hajnoczi > On Apr 13, 2016, at 1:07 PM, John Snow wrote: >=20 > Why do you want to use IDE? If you are looking for performance, why = not > a virtio device? I=E2=80=99m just trying to understand how IDE emulation works and see = where the overhead comes in. Thank you for the detailed explanation. I really = appreciate=20 that. Best, Huaicheng=