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Posted to users@cloudstack.apache.org by Nux! <nu...@li.nux.ro> on 2014/02/24 16:06:23 UTC

Limit CPU flags exposed to the VM

Hello,

I'm having some troubles migrating VMs between certain Xenservers that 
are very similar, it's just the CPUs vary slightly. With KVM/libvirt I 
can limit the CPU flags exposed to the VM, how would I do the same with 
Xenserver?

Lucian

-- 
Sent from the Delta quadrant using Borg technology!

Nux!
www.nux.ro

Re: Limit CPU flags exposed to the VM

Posted by Nux! <nu...@li.nux.ro>.
On 24.02.2014 18:17, Tim Mackey wrote:
> Here's a good article describing how everything behind CPU masking 
> works:
> http://support.citrix.com/article/CTX127059.  One key item to note is 
> you
> might need to do something in your BIOS to enable the feature.  Don't 
> worry
> about the age of the article; everything's still relevant.
> 
> (btw Citrix support site appears to be having a problem right now, so 
> if
> you google for CTX127059 and look at the cached version)
> 

Thanks, guys, it worked!
I had to get the compare-cpu script from here as I couldn't find it 
elsewhere:
http://www.cl.cam.ac.uk/xen/XenE/host-cpu-info/

Lucian

-- 
Sent from the Delta quadrant using Borg technology!

Nux!
www.nux.ro

Re: Limit CPU flags exposed to the VM

Posted by Tim Mackey <tm...@gmail.com>.
Here's a good article describing how everything behind CPU masking works:
http://support.citrix.com/article/CTX127059.  One key item to note is you
might need to do something in your BIOS to enable the feature.  Don't worry
about the age of the article; everything's still relevant.

(btw Citrix support site appears to be having a problem right now, so if
you google for CTX127059 and look at the cached version)

-tim


On Mon, Feb 24, 2014 at 12:07 PM, Nux! <nu...@li.nux.ro> wrote:

> On 24.02.2014 16:13, Geoff Higginbottom wrote:
>
>> What version of XenServer are you using?
>>
>> 6.2 supports Heterogeneous Resource Pools, so this should allow some
>> flexibility, but older versions do not.
>>
>> http://www.xenserver.org/overview-xenserver-open-
>> source-virtualization/open-source-virtualization-features.html
>>
>
> Thanks Geoff, that might be something useful! I'm on 6.2SP1.
>
>
> Lucian
>
> --
> Sent from the Delta quadrant using Borg technology!
>
> Nux!
> www.nux.ro
>

RE: Limit CPU flags exposed to the VM

Posted by Nux! <nu...@li.nux.ro>.
On 24.02.2014 16:13, Geoff Higginbottom wrote:
> What version of XenServer are you using?
> 
> 6.2 supports Heterogeneous Resource Pools, so this should allow some
> flexibility, but older versions do not.
> 
> http://www.xenserver.org/overview-xenserver-open-source-virtualization/open-source-virtualization-features.html

Thanks Geoff, that might be something useful! I'm on 6.2SP1.

Lucian

-- 
Sent from the Delta quadrant using Borg technology!

Nux!
www.nux.ro

RE: Limit CPU flags exposed to the VM

Posted by Geoff Higginbottom <ge...@shapeblue.com>.
What version of XenServer are you using?

6.2 supports Heterogeneous Resource Pools, so this should allow some flexibility, but older versions do not.

http://www.xenserver.org/overview-xenserver-open-source-virtualization/open-source-virtualization-features.html

Regards

Geoff Higginbottom

D: +44 20 3603 0542 | S: +44 20 3603 0540 | M: +447968161581

geoff.higginbottom@shapeblue.com

-----Original Message-----
From: Nux! [mailto:nux@li.nux.ro]
Sent: 24 February 2014 15:06
To: users@cloudstack.apache.org
Subject: Limit CPU flags exposed to the VM

Hello,

I'm having some troubles migrating VMs between certain Xenservers that are very similar, it's just the CPUs vary slightly. With KVM/libvirt I can limit the CPU flags exposed to the VM, how would I do the same with Xenserver?

Lucian

--
Sent from the Delta quadrant using Borg technology!

Nux!
www.nux.ro
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