Re: [libvirt-users] [Qemu-devel] Sluggish performance with virtio and Win10
On Fri, Feb 19, 2016 at 08:50:12AM +0100, Martin Kletzander wrote:
On Fri, Feb 19, 2016 at 07:16:12AM +0100, John Obaterspok wrote:
>I changed from vmdk to raw and the Write performance went from 1.6 MB/s to
>~100 MB/s
Now that's interesting! Of course raw will be faster but by 2 orders of
magnitude? That seems unreasonably much more than it should be.
>Is vmdk write performance so bad?
>
I can't say, I wouldn't even expect that -- that's why I didn't even
suggest it.
The only native formats in QEMU are raw, qcow2, and qed. They support
parallel I/O.
All other formats are only suitable for qemu-img convert so you can
import/export images.
Depending on the workload there can be a large performance difference.
Stefan
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