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Thread: VirtualBox Is Still Running Slower Than QEMU-KVM

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  1. #1
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    Default VirtualBox Is Still Running Slower Than QEMU-KVM

    Phoronix: VirtualBox Is Still Running Slower Than QEMU-KVM

    Recently I ran some benchmarks looking at the performance of the Ubuntu 14.04 LTS development code and from there I tested the bare metal system, the same system with a Linux KVM instance of Ubuntu 14.04 itself, and then afterwards another VM with the same settings and software but using Oracle VM VirtualBox. Here are those early Ubuntu 14.04 Linux virtualization benchmarks.

    http://www.phoronix.com/vr.php?view=19551

  2. #2
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    You should pass "-cpu host" to qemu so that it passes-through the processor identifier and flags

  3. #3
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    Any graphics benchmarks? QEMU-KVM graphics performance sucks.

  4. #4
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    Quote Originally Posted by wargames View Post
    Any graphics benchmarks? QEMU-KVM graphics performance sucks.
    Not if you use VGA passthrough.

  5. #5
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    Quote Originally Posted by GreatEmerald View Post
    Not if you use VGA passthrough.
    VGA passthrough requires an additional graphics adapter, not everyone has that and not everyone wants to use separate cards for bare metal and the VM.

  6. #6
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    Quote Originally Posted by Calinou View Post
    VGA passthrough requires an additional graphics adapter, not everyone has that and not everyone wants to use separate cards for bare metal and the VM.
    Yes, but it is an option, and it's one that is available in QEMU-KVM and not available in VirtualBox.

  7. #7
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    Quote Originally Posted by GreatEmerald View Post
    Yes, but it is an option, and it's one that is available in QEMU-KVM and not available in VirtualBox.
    Do you know if it is possible to use the integrated (motherboard/APU) graphics for the host and a dedicated graphics card for the guest?

  8. #8
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    Quote Originally Posted by wargames View Post
    Any graphics benchmarks? QEMU-KVM graphics performance sucks.
    With QXL things are much smoother (2D). With Windows guests I usually prefer RDP (2D). Both are excellent under QEMU-KVM.

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