From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([208.118.235.92]:33485)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <kraxel@redhat.com>) id 1TORwZ-0008FP-7X
	for qemu-devel@nongnu.org; Wed, 17 Oct 2012 07:37:48 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <kraxel@redhat.com>) id 1TORwS-0000B8-Ol
	for qemu-devel@nongnu.org; Wed, 17 Oct 2012 07:37:47 -0400
Received: from mx1.redhat.com ([209.132.183.28]:10542)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <kraxel@redhat.com>) id 1TORwS-0000B4-GX
	for qemu-devel@nongnu.org; Wed, 17 Oct 2012 07:37:40 -0400
Received: from int-mx02.intmail.prod.int.phx2.redhat.com
	(int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12])
	by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q9HBbdLQ030241
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK)
	for <qemu-devel@nongnu.org>; Wed, 17 Oct 2012 07:37:39 -0400
Message-ID: <507E9881.2090809@redhat.com>
Date: Wed, 17 Oct 2012 13:37:37 +0200
From: Gerd Hoffmann <kraxel@redhat.com>
MIME-Version: 1.0
References: <1350297511-25437-1-git-send-email-hdegoede@redhat.com>
	<1350297511-25437-7-git-send-email-hdegoede@redhat.com>
	<507BF0C6.9010300@redhat.com> <507C08D1.9070607@redhat.com>
	<507E9014.7010507@redhat.com> <507E9249.3080404@redhat.com>
In-Reply-To: <507E9249.3080404@redhat.com>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] [PATCH 06/22] ehci: Speed up the timer of raising
 int from the async schedule
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: Hans de Goede <hdegoede@redhat.com>
Cc: qemu-devel@nongnu.org

  Hi,

> 1) It causes migration issues when migrating to / from an old version

With -1 yes, shifting the scale shoudn't be a that big issue though as
it is just a optimization.

> 2) We don't want to change the wakeup rate when the interrupt flag gets set
> as pending, but when it actually gets committed, and we only want to change
> the wakeup rate when the int was requested by an async packet, not when it
> was requested by a periodic packet, so we will need the int_req_by_async
> flag anyways, as which point this seemed the cleanest way.

Missed that little details, ok then.

cheers,
  Gerd