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Re: [Xen-devel] Xen and VMware

Tom Hibbert wrote:
Typical corporate talking head blah. Interesting that he talks about
Vmotion as a 'killer technology' when Xen is already doing it. If you read the interview there's quite a bit of Xen-bashing. The guy
rags on the requirement for modification of the host kernel. He is
comparing the two products as if they took the same approach, failing to
mention that Xen's paravirtualisation architecture eliminates all of the
costly performance overhead his company's product is famous for...

I still think you need to respect VMWare for breathing new life into virtual machine research. And I still think Xen can be improved (as is happening now) with regards to memory footprint etc. VMWare ESX is also likely to have some performance benefits from having the drivers in the kernel, even though that comes at the cost of them having to implement the drivers themselves. And the fact that they can host Windows is a big win with lots of customers.

VMWare does some amount of paravirtualization, with all the VMWare tools that you need to install. In fact, Xen seems to be going in VMWare's direction (shadow page tables, writable page tables, binary rewriting, Vanderpool support) in some areas.

The fact that I seem to have prior art for their 'killer technology' I just find kind of funny ;-)


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