[virglrenderer-devel] Strange graphical glitches under virgl.

[Lepton Wu]

Thanks Gurchetan he confirmed with me that he didn't see such kind of
issue in his setup.
So I just upgraded everything to TOT and find out this issuse was
gone. With bisect, I tracked down
this issue get fixed by this one:

https://patchwork.freedesktop.org/patch/230529/

So I guess does this mean there is some bug for regular memcpy code path?
On Fri, Jul 20, 2018 at 2:28 PM Gurchetan Singh
<gurchetansingh at chromium.org> wrote:
>
> On Fri, Jul 20, 2018 at 2:21 PM Lepton Wu <lepton at chromium.org> wrote:
> >
> > Hi,
> >
> > I have an issue which I recorded a video  to show the bug:
> > https://youtu.be/ECGDCMAOTxs
> > You can see, sometimes, there is a "wrong block" of rendering. It's
> > always some kind of rectangle somewhere.
> > A strange part is: I've never seen this kind of issue if I am running
> > 3D android games under virgl. Games always
> > running fine. But for Chrome, it sometimes come with this kind of
> > weird graphics.
> >
> > So I have 2 questions:
> >
> > 1.  What kind of guest are you using to test virgl?  I am trying to
> > test some other guests to see if I can reproduce
> > same issue so I can confirm if this is something specific to my guest
> > (Chrome OS).
>
> Most people use Ubuntu VMs.  It's a bit of work to setup -- I'll add
> some instructions to "Virgl tips and tricks" document and upload a VM
> to the cloud.
>
> > 2.  Do you have any rough idea that this is actually some fixed bug
> > upstream somewhere?  I am using TOT virglrenderer + TOT qemu.
> > But my mesa (mesa-18.1_pre1) and linux kernel (4.4) in guest which
> > could be a little outdated.
> >
> > Thanks for your help!
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> > virglrenderer-devel at lists.freedesktop.org
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