Brett Mahar <[email protected]> writes:
>> That sounds suspiciously like you are either running fully emulated (eg: no
>> KVM support) on Slackware, or that you don't have virtio on that platform.
>
>> It would be interesting, to me, to know if either of those guesses were
>> true, because I have a current need to improve my skills diagnosing KVM
>> performance issues and feedback helps with that. :)
>
> I only thought it was that because I could not think what else it could
> be. In the next few weeks I hope to have some time to investigate further,
> and will let you know.
Well, cool. FWIW, checking for virtio should be as simple as lspci inside the
guest, and checking if you have a "virtio" device or not.
>> Is the backing store for the virtual machine also on the USB disk? If so
>> it would point a finger toward guest I/O performance is the pain point, and
>> the introduction of USB would just be making a painful service slower.
>
> In all cases the virtual hard drive was on an (real) external usb drive (not
> the same one as the host OS was sometimes on). So I don't think the guest
> I/O is the culprit.
Yeah, that would eliminate that by ensuring it was identical.
Daniel
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