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xen-users
Re: [Xen-users] [XEN 3.3 - PCI passthrough] - interaction latencies with
jer jer wrote:
Thanks for your help Ken,
I'm gonna have a look to the USB over IP solution.
Nevertheless, in addition to my post, I ran further tests and noticed
that when processing test on dom0 (no passthrough), everything works
fine (no more latencies).
So, I'm about to conclude that the problem is due to PCI passthrough.
I'm a litlle bit surprised, cause I thought that doing this would have
given direct USB access.
Is it known that pci passthrough pull down performances?
Furthertmore, I've read that XEN 3.4 will introduce virtualized USB
driver. So can we concluide that no more support will be done on PCI
passthrough?
Finally, do you have any perf issues running USB over IP?
Tks a lot!
It would be great to see complete USB virtualization in Xen.
However, I don't think that would take away from PCI passthrough.
Simply, there are other devices that are PCI devices and not USB, that
could be passed to a domU.
With regards to USB over IP, I have only implemented a Digiboard
hardware product called AnywhereUSB,
http://www.digi.com/products/usb/anywhereusb.jsp
The only concern someone may have about AnywhereUSB is it will only
support USB 1.0 speeds for all devices. In my application, that was not
an issue.
Ken Cobler
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