Re: [kvm-devel] kvm with usb slow

[Norbert P. <pre...@lo...>]

Hi Arnon,

thanks a lot for the response,

On Mo, 07 Jan 2008, Arnon Gilboa wrote:
> USB redirection support in qemu  is currently using synchronous ioctls,
> which might block the guest for too long (>100usec). The current host
> controller emulations allow only one pending transfer at a time, which
> might slow down the guest as well.

Ok, I understand. So anything which is a bit complicated usb device
(like my GPS receiver) will have problems.

> If you are using simple bulk device (disk on key, printer etc.), you can
> try the patch of USB 2.0 EHCI emulation, recently submitted to
> qemu-devel. It is at very preliminary stage, but still might be useful
> for you.

I will try (to find and use it).

Thanks a lot and all the best

Norbert

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Dr. Norbert Preining <pre...@lo...>        Vienna University of Technology
Debian Developer <pre...@de...>                         Debian TeX Group
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