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  1. #1
    Join Date
    May 2010
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    Exclamation XEN PV vs XEN HVM, how much is HVM slower?

    Ok, one simple question. How much is HVM slower then PV?

    ...Fully virtualized guests are usually slower than paravirtualized guests, because of the required emulation.
    http://wiki.xensource.com/xenwiki/XenOverview

    I am currently with a host who has Ubuntu 10.04 LTS spiked (taking up CPU immediately after provision and never stops). The host refuses to acknowledge this as a high priority bcoz they dont have demand for this template. My question is, how much is HVM slower then PV? I may ask that particular host to move me to HVM instead

  2. #2
    Join Date
    May 2010
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    We found that the difference between Xen PV and HVM is about 5%.
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  3. #3
    Join Date
    Dec 2005
    Location
    Berkshire, UK
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    3,070
    In the real-world and on paper, PV is slightly faster than HVM. That said, it depends entirley on how the provider configures Xen HVM as well.

    Customers on our HVM platform give the majority of Xen PV providers a beating on performance with the latest version of Unixbench.
    SmartServerMangement (SSM)
    Specialists in SolusVM, VPS & cPanel Server Management

  4. #4
    Join Date
    May 2010
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    Pakistan
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    Wow, thanks

    by the way, my benchmark results of the same 512MB/Ubuntu 10.04 LTS on XEN PV and HVM were 599 and 2200 respectively.

  5. #5
    Join Date
    Aug 2009
    Posts
    3,168
    Very much depends the HVM configuration and supported hardware.
    If you need something fully virtualized, HVM is the best option for you, especially when you have downtime and need to recover your data via the interface.
    What we run HVM is slightly lower perfomance than pv itself. But, no benchmark done at this moment.
    ControlVM Technology
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  6. #6
    Quote Originally Posted by asimzeeshan View Post
    Wow, thanks

    by the way, my benchmark results of the same 512MB/Ubuntu 10.04 LTS on XEN PV and HVM were 599 and 2200 respectively.
    The benchmark results are completely dependent on the hardware setup of the nodes (PV vs. HVM) - did you get the benchmark results on same server/node ?
    Fast & Reliable Unmanaged VPS w/SolusVM ★★ Sandy Bridge E3-1270 @ 3.40Ghz pr Core
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  7. #7
    Join Date
    Jan 2006
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    1,385
    I don't think it will even be noticeable to yourself or clients. Meaning each one. Obviously your clients are going to want the one with the most features and easiest navigation. I would choose (obviously) the one that is raved about by fellow VPS users!

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