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Thread: Virtualbox seems slower compared to virt manager

  1. #11
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    Default Re: Virtualbox seems slower compared to virt manager

    BTW -
    You can implement 3D acceleration in KVM and Xen, it's just not a simple "click the box"

    The following describes a starting point to what is possible (don't know what virtualization you're actually running, libvirt is only a management option, not the actual virtualization technology)

    https://wiki.archlinux.org/index.php...s_acceleration

    I haven't tried Looking Glass but I notice it's in the openSUSE software package search.
    https://software.opensuse.org/packag...g-glass-client

    QXL is an option which has been around for awhile, GPU pass-through is getting easier (Looking Glass is one method) but still on the bleeding edge.

    TSU
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  2. #12
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    Default Re: Virtualbox seems slower compared to virt manager

    Quote Originally Posted by tsu2 View Post
    Regarding performance,
    It's important to understand when comparing virtualization technologies that because of Hardware assist (ie Intel and AMD CPU virtualization extensions) it's unlikely that you'll find anything that's related to CPU or RAM functionality aside from various configuration options like allocated amounts, shared pages, ballooning, etc.

    The most likely places you'll find differences are related to I/O because today it's not virtualized and there aren't many standards (aside from IOMMU),
    There will be settings for disk access and block/partition alignment but the latter only applies if you copy virtual machines from one Host to another, and might involve a Windows file system and Linux file systems.
    Device I/O can vary greatly, some virtualization are better, others not.

    Keep in mind that many Virtualbox features are "experimental" and have been for years because maintainers don't yet want to guarantee their work. I've found some things like 2D/3D and nested paging either don't work well or at all in the past, but from the 6.0 documentation appear to maybe be substantially improved.

    All you can do is read what documentation you have, try some tweaking with careful design, and likely go to the VBox Forums and ask questions directly to the VBox maintainers.

    TSU
    I noticed a slight inaccuracy in what I wrote here...
    When I said "I/O is not virtualized, I should have said that how I/O is handled is uneven, and you can't always expect virtualized drivers. Progress has been slow, some I/O has been virtualized, some virtualized drivers have been replaced and improved, and some I/O is not virtualized at all which can suggest some options and improvement. Read the documentation for your particular virtualization for guidance how best to optimize.

    And, this can generally be said for all virtualization technologies today.

    TSU
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