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-users

Re: [Xen-users] io scheduler

To: Xen Users <Xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] io scheduler
From: tbrown@xxxxxxxxxxxxx
Date: Mon, 9 Jan 2006 13:47:59 -0800 (PST)
Delivery-date: Mon, 09 Jan 2006 21:54:15 +0000
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <43C2C4EF.8020604@xxxxxxxxxxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
Cool. I didn't know some of this stuff existed...  e.g.
Documentation/block/ioprio.txt

Can anyone tell what (if any) knowledge XEN has of this? Can it pass I/O
priorities from a domU to the dom0, or can we assign I/O priorities to a
whole domU ?


On Mon, 9 Jan 2006, Mogens Valentin wrote:

<snip>
>
> On non-xen, yes. There's some benchmarks somewhere (don't seem to find
> them right now) about advanteges of the various ones.
> /usr/src/linux/Documentation/kernel-parameters.txt  says a few words.
>
> As you've seen for yourself, the scheduler can be changed runtime, and
> likewise as a boot option.
> My understanding is that schedulers works fairly directly on hardware,
> at least reorganizing disk queues, I -think- you cannot have different
> schedulers for dom0 and domU's.
> Why would you? It's the same physical disk...
> I believe cfq is usually considered the most versatile, unless specific
> needs are determined.

Looks that way...  from my 5 minutes of reading...

-Tom

----------------------------------------------------------------------
tbrown@xxxxxxxxxxxxx   | What I like about deadlines is the lovely
http://BareMetal.com/  | whooshing they make as they rush past.
web hosting since '95  | - Douglas Adams


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