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Arjun Venkatraman writes:
> All, apologies, can't share the article till next month I believe.
> However, @Ashish, agreed Xen is much more forgiving when it comes to
> supported hardware, but you really cant compare Xen's performance on a
> server class system to its results on a desktop class machine. 

With hexacore CPUs, fast memories, SSDs, NICs available for desktops, I guess
the gap is getting narrower. And IIRC, the article is about desktop class
hardware ;)

> Also, last I checked, which was some time in Oct 2010, there were also
> restrictions on adding machines with heterogeneous CPUs to a server cluster
> (If this has changed, I would love to be updated).

Could you please explain, what you mean by that?

> Finally, unless you're running a Xen modified kernel on your guest OS, you
> really dont get much mileage from it.  Essentially I left Xen out on the
> same token that I left ESX out, i.e.  designed for a different class of
> systems.

Not anymore. Thanks to paravirt_ops[1] kernel support which was present in
Linux kernel since 2.6.23, you can use same kernel to boot as dom0, domU, or
without Xen. I've never used VMware ESX (nor I intend to), but from what I
heard it's more like a virtualization OS made to run on bare metal, unlike Xen
which doesn't restrict you in this way, so you can use dom0 for different
purpose.

References:
[1]  http://wiki.xensource.com/xenwiki/XenParavirtOps

HTH
- -- 
Ashish SHUKLA

“Life's unfair - but root password helps!” ("Eygene Ryabinkin", ".sig
of Eygene Ryabinkin", 2010)
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