[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] Xen 4.7.0 graphics pass through problems (Win10, AMD Radeon)
On 14/09/16 14:23, Andrew Cooper wrote: > On 14/09/16 13:50, Jan Beulich wrote: >>>>> On 14.09.16 at 13:34, <george.dunlap@xxxxxxxxxx> wrote: >>>> On 2016-09-09 09:51, Peter Milesson wrote: >>> [snip] >>>>> I've been using Xen for 3 years, starting out with 4.2, and I've been >>>>> upgrading regularly, and installed 4.7.0 today. >>>>> >>>>> I'm using Windows 10, 64-bit with PCI pass through in a VM with >>>>> PV-drivers, using a AMD Radeon HD6450 card (AMD graphics cards don't seem >>>>> to >>>>> need graphics pass through) >>>>> >>>>> Previously (up till Xen 4.6.3), the graphics output has displayed some >>>>> shorter lines, a bit like thin coarse snow, when watching videos. The >>>>> distortions stayed within the movie, and was tolerable. >>>>> >>>>> After upgrade to Xen 4.7.0, the video performance is seriously ugly. Just >>>>> for example, I open cnn.com and move the mouse pointer up and down over >>>>> the >>>>> photos, which creates a bunch of flickering lines over the display. The >>>>> same >>>>> with moving content in Youtube for example. Or opening a Cygwin terminal >>>>> window and scrolling through a file. Terrible. >>>>> >>>>> Nothing else has changed, only the Xen version. >>> [snip] >>> >>> On Fri, Sep 9, 2016 at 10:35 AM, Peter Milesson <miles@xxxxxxxx> wrote: >>>> Hi again, >>>> >>>> I've been playing around a bit more. >>>> >>>> It seems one of the problems is that I passed a couple of PCI-devices (USB >>>> controllers) to the VM, beside the graphics card. >>>> >>>> When I pass the USB-devices individually in the VM configuration file >>>> (usbdevice=['tablet','host:1.4','host:1:9','host:x.y']), the display >>>> problems seem to be more or less gone. >>> Jan / Andy, >>> >>> Can you think of anything that's changed between 4.6 and 4.7 that >>> would cause the performance problems he's describing when both a video >>> card and a usb controller are passed through, but not when only the >>> video card is passed through? >> Not really, no. Peter - are there any indications of problems in >> one or more of the logs (Xen, xl, qemu)? Did you try running a >> debug build of all Xen components? > > Furthermore, does "Nothing else has changed, only the Xen version." mean > switching your distro packages between two versions of xen, or literally > only switching the hypervisor itself. I assume he's using "Xen" to mean the whole Xen system -- hypervisor + tools + qemu. > A substantial quantity of the complexity here is in qemu, rather than Xen. Rather than the hypervisor, you mean. Another thing worth asking, Peter: Have you tried running with qemu-traditional (by adding the line below to your config file) rather than qemu-upstream, to see if that makes a difference? device_model_version="qemu-xen-traditional" qemu-traditional almost ever changes, so if it worked better, then that would point the finger at changes in qemu (at which point we would have to bring in a different set of people to help diagnose it). -George _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxx https://lists.xen.org/xen-users
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