[Xen-users] Re: 32 bit versus 64 bit

[Sami Haahtinen <ressu@xxxxxxxxxxxx>]

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Nicholas Lee wrote:
> 64 bit will give you a definite bonus in performance.  I've seen two
> times speed jump in some tests for full 64 bit.  Even 32bit userland
> gets a big boost from the extra registers with a 64bit kernel.
> 
> I'd suggest running a 64bit domU kernel with a 32 bit userland.

Does anyone have experience on switching the kernel from 32 to 64 bit
without updating any apps. I'm looking to get Xen up and running but
that would mean that i have to manually compile 64 bit version and tie
that in to the selected distro, while 32 bit versions of Xen are easily
available.

I'm hoping to start with 32 bit version, and upgrade to 64 bit later on
when it is better integrated, by upgrading to 64 bit Dom0 and switching
the DomU kernels from 32 bit to 64 bit and dealing with the userland
later on.

Any hope here?

- - S
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