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Re: [Xen-users] GPLPV, clock drift and PVUSB in Windows XP HVM

> 1. Shouldn't the GPLPV drivers take care of the (bad) clock drift I'm
> experiencing in my Windows XP HVM? Or is there some other way around
> this problem that I haven't been able to find on Google? How can I tell if the
> GPLPV drivers are active? I've added the /gplpv switch to the boot.ini file 
> and
> the virtual NIC is definitely using the GPLPV version but other than that I'm
> not sure how to tell.

You don't need to use any switches to make gplpv active. You can use the 
/nogplpv switch to make it inactive if required for testing, but that only 
deactivates the vbd and vif drivers.

GPLPV won't (shouldn't) have any impact on clock drift. If you only get clock 
drift when running with GPLPV then let me know.

> 2. On this same Windows XP HVM, I'd like to experiment with the PVUSB 2.0
> pass thru. My server (Dell PowerEdge 2900) does NOT support IOMMU so it
> can't be hardware. I've read that the PVUSB performance is up to about 60%
> of native 2.0, but still better than the qemu 1.1 pass thru. Unfortunately, I
> can't find any documentation online about how to actually use it. Currently I
> have these lines in my .cfg file:
> usb = 1
> usbdevice = 'tablet'
> usbdevice = 'host:xxxx:yyyy'
> Obviously I would need to remove the host: line to free up the device from
> qemu pass thru so I can use PVUSB pass thru instead, but after that I'm not
> sure what commands to issue or put in the domain's .cfg file.
> P.S. I did choose to install PvUsb when installing GPLPV so I'm assuming 
> that's
> all I need to do on the domU end.

You need to make sure you have usb backend drivers in your dom0, then you use 
xm to add host controllers and devices. Google for usb-hc-create and you should 
find some info.


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