From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: events/0 and xenconsoled wakeups
Date: Tue, 29 Mar 2011 14:14:04 -0700
Message-ID: <4D924B9C.40701@goop.org>
References: <156928305.20110325232803@eikelenboom.it>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-15
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xensource.com>
In-Reply-To: <156928305.20110325232803@eikelenboom.it>
List-Unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xensource.com>
List-Help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-Subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
Sender: xen-devel-bounces@lists.xensource.com
Errors-To: xen-devel-bounces@lists.xensource.com
To: Sander Eikelenboom <linux@eikelenboom.it>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
List-Id: xen-devel@lists.xenproject.org

On 03/25/2011 03:28 PM, Sander Eikelenboom wrote:
> Hi Jeremy,
>
> Is this thing still on your list ?
> http://www.gossamer-threads.com/lists/linux/kernel/1281515
>
> Ran powertop today, and events/0 and xenconsoled seem to be still responsible for the majority of wakeups.

Yeah.  Unfortunately the underlying bug is a design error in the tty
subsystem, which will be hard to fix.  However, the one-liner fix can
mitigate the problem and reduce the wakeups to 100Hz.

Also, attaching a console to the various hvcs will also fix it.

    J