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-devel] [PATCH][2/4] Enable 1GB for Xen HVM host page

To: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>, Wei Huang <wei.huang2@xxxxxxx>
Subject: Re: [Xen-devel] [PATCH][2/4] Enable 1GB for Xen HVM host page
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Tue, 23 Feb 2010 18:09:31 +0000
Cc: "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx>, "Keir@xxxxxxxxxxxxxxxxxxxx" <Keir@xxxxxxxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Delivery-date: Tue, 23 Feb 2010 10:14:33 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <4bc57870-0038-429f-ad50-990cd2e33ee9@default>
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>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: Acq0rO+pIhZRbTNSTyepRttS6h3mJgABmjTd
Thread-topic: [Xen-devel] [PATCH][2/4] Enable 1GB for Xen HVM host page
User-agent: Microsoft-Entourage/12.23.0.091001
The use of 1GB extents is just a (small-ish) performance win. If you can
only back with 4kB or 2MB extents on the target host it doesn't matter that
much.

 -- Keir

On 23/02/2010 17:19, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote:

> I'll bet save/restore/migration for 1GB pages will be a fun challenge.
> 
> At least please set the "no_migrate" flag automatically for
> any domain that uses 1GB pages unless/until live migration
> is supported.
> 
>> -----Original Message-----
>> From: Tim Deegan [mailto:Tim.Deegan@xxxxxxxxxx]
>> Sent: Tuesday, February 23, 2010 6:01 AM
>> To: Wei Huang
>> Cc: Keir@xxxxxxxxxxxxxxxxxxxx; Xu, Dongxiao; xen-
>> devel@xxxxxxxxxxxxxxxxxxx; Fraser
>> Subject: Re: [Xen-devel] [PATCH][2/4] Enable 1GB for Xen HVM host page
>> 
>> At 17:18 +0000 on 22 Feb (1266859100), Wei Huang wrote:
>>> Change page allocation code in Xen tools. The allocation request now
>>> starts with 1GB; if that fails, then falls back to 2MB and then 4KB.
>> 
>> Can we have an equivalent patch for the save/restore path please?  That
>> took a while to catch up when 2MB superpages were introduced.
>> 
>> Tim.
>> 
>> --
>> Tim Deegan <Tim.Deegan@xxxxxxxxxx>
>> Principal Software Engineer, XenServer Engineering
>> Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)
>> 
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-devel



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