Re: [Xen-devel] Xen 4.3: x86 32 bit code removed or depreciated?

[Ian Murray <murrayie@xxxxxxxxxxx>]

----- Original Message -----
> From: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
> To: Ian Murray <murrayie@xxxxxxxxxxx>
> Cc: Jan Beulich <JBeulich@xxxxxxxx>; xen-devel <xen-devel@xxxxxxxxxxxxx>
> Sent: Wednesday, 10 July 2013, 12:32
> Subject: Re: [Xen-devel] Xen 4.3: x86 32 bit code removed or depreciated?
> 
> On Wed, Jul 10, 2013 at 12:28 PM, Ian Murray <murrayie@xxxxxxxxxxx> wrote:
> 
>>>  Just to be clear, this is the 32-bit *hypervisor* which was removed.
>>>  32-bit tools in a 32-bit dom0 still work.
>>> 
>> 
>>  Thanks. Thanks for clearing that up. Perhaps off-topic for dev, but are 
> there any advantages to running a 32 bit dom0 as in this configuration?
> 
> Probably the biggest thing is about performance.  Until the PVH mode
> is implemented, 64-bit PV guests will have a performance degradation,
> due to the way the architecture changed between 32-bit and 64-bit.
> The reason is quite technical, but you can read a summary of it here:
> 
> http://blog.xen.org/index.php/2012/10/31/the-paravirtualization-spectrum-part-2-from-poles-to-a-spectrum/
> 
> -George

Thanks. I was alluding to this when I asked. I have looked at the blog post 
before when trying to understand what PVH was. I will give it a proper read. 
Hopefully I can follow enough of it.

Thanks again.


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