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Re: [Xen-users] Measure disk activity in full-virtualization.
| To: | deshantm@xxxxxxxxx |
|---|---|
| Subject: | Re: [Xen-users] Measure disk activity in full-virtualization. |
| From: | "Alain Barthe" <ab266061@xxxxxxxxx> |
| Date: | Mon, 21 Jul 2008 11:21:23 +0200 |
| Cc: | Alejandro Paredes <aleparedes@xxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Mon, 21 Jul 2008 02:22:04 -0700 |
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2008/7/20 Todd Deshane <deshantm@xxxxxxxxx>:
I am very surprised by this publication whose conclusion is that a full virtualised environment (VMWare) provides a perfect isolation between VMs while a para virtualised one (Xen) is good but not perfect. Our experience concerns WMWare server and Xen, we done some subjective and practical tests (measuring the time some real huge tasks take to acheive) and listen to users complains, and the results were quite clear : on VMWare server, when a VM is very busy, its process eats all the CPU it runs on, and other VMs slow down significantly along with the host itself. When the number of VCPU exceeds the number of CPU (it is the general case), you may have a delay of several second to see the echo of the character you typed on a VM that does nothing because another one on the same host is 100% busy. With Xen, no such a behaviour, isolation looks like much better. That why we migrated all our servers from VMWare to Xen. Perhaps benchmarks don't always reflect the real world... Alain. _______________________________________________ _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users |
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