A while back, I told you about XenSource and VMware comparing benchmarking numbers.  VMware's white paper compared VMware ESX Server 3.0.1 to Xen 3.0.3.  XenSource cried foul and came out with their own benchmark numbers.  Unfortunately, you cannot publish benchmark results from VMware's products without permission from VMware.  Well, XenSource submitted their results for approval, and VMware authorized it.  Here is what Roger Klorese, Senior Director Product and Solutions Marketing, wrote on his Blog:

Our performance comparison of XenSource XenEnterprise 3.2 beta to VMware ESX Server 3.0.1 is now available, having been vetted and approved by VMware’s benchmark police.

As hinted at earlier, we have nothing to be ashamed of, and lots to be proud of, given the fact that XenEnterprise hasn’t reached its first birthday yet. In most tests, the results for the two virtualization platforms are essentially indistinguishable; in the Linux test, the value of paravirtualization is borne out strongly.

Thanks to our competitors across Palo Alto for their speed in reviewing and approving the results and paper. While we still find the process to be one-sided and ultimately unfriendly to the marketplace, given the limitations, they came through.

 Read it, here.