From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: PATCH: Jeremy's linux 2.6.33-pvops: wrong gntdev
Date: Wed, 04 Aug 2010 12:21:55 -0700
Message-ID: <4C59BDD3.6060602@goop.org>
References: <201008012127.17188.brade@kde.org>	<201008041930.12163.brade@kde.org>
	<4C59A96D.8040506@goop.org> <201008042043.40476.brade@kde.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xensource.com>
In-Reply-To: <201008042043.40476.brade@kde.org>
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: Michael Brade <brade@kde.org>
Cc: xen-devel@lists.xensource.com
List-Id: xen-devel@lists.xenproject.org

  On 08/04/2010 11:43 AM, Michael Brade wrote:
> XFS has been my filesystem of choice for at least 5 years I think. Never had
> any issues with it. Before I used reiserfs and before that I had ext2/3 but
> that one gave me too many problems so I never tried it again.
>
> Would you recommend anything else instead?

I ask because xfs does some memory mapping tricks which are actually 
fairly awkward to handle in a PV Xen domain.  We end up disabling its 
lazy vunmap behaviour, which means there's a bit more overhead from tlb 
flushes and the like.  I don't know what kind of performance effect that 
actually has, or in what circumstances.

     J