Is virtual machine slower than the underlying physical machine?

Posted by Michal Illich on Server Fault See other posts from Server Fault or by Michal Illich
Published on 2010-04-24T07:18:00Z Indexed on 2012/12/17 23:05 UTC
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Filed under:

virtualization

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Performance

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cloud-computing

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benchmarks

This question is quite general, but most specifically I'm interested in knowing if virtual machine running Ubuntu Enterprise Cloud will be any slower than the same physical machine without any virtualization. How much (1%, 5%, 10%)?

Did anyone measure performance difference of web server or db server (virtual VS physical)?

If it depends on configuration, let's imagine two quad core processors, 12 GB of memory and a bunch of SSD disks, running 64-bit ubuntu enterprise server. On top of that, just 1 virtual machine allowed to use all resources available.

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