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

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

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

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