WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

Re: [Xen-users] Re: [Xen-devel] VM disk I/O limit patch

To: Florian Heigl <florian.heigl@xxxxxxxxx>
Subject: Re: [Xen-users] Re: [Xen-devel] VM disk I/O limit patch
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Wed, 22 Jun 2011 09:07:10 -0400
Cc: Andrew Xu <xu.an@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
Delivery-date: Wed, 22 Jun 2011 06:08:42 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <BANLkTikGiuOAcyZhOTKpANkHktWMCrtjsw@xxxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <20110621162935.F4A1.3A8D29D5@xxxxxxxxxx> <20110621133337.GD5650@xxxxxxxxxxxx> <BANLkTikGiuOAcyZhOTKpANkHktWMCrtjsw@xxxxxxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mutt/1.5.21 (2010-09-15)
On Wed, Jun 22, 2011 at 02:16:09PM +0200, Florian Heigl wrote:
> Hi,
> 
> relying on DM is not advisable since this is yet another layer that
> breaks write barriers, plus it kills portability to non-linux OS.

How so? And write barriers don't exist anymore - I think you mean
flush support. And I believe they are fixed now - flush requests
are passed through to the bottom layer (the real disk). But let
me double check that shortly.

Portability to non-linux OS? ? What do you mean by that? As in using
this patch on NetBSD or OpenSolaris backend? The backend in those
OS-es is quite different so it wouldn't be "portable"

> 
> btw:
> It would be cool if a block shaping patch finally made it in the Xen
> mainline, since the last one that was submitted in 2009 was apparently
> forgotten...

Why can't dm-ioband do this for you? Hm, I don't remember seeing that patch
at all?

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel