Based on those glreadtest results, you can probably squeeze out additional
performance by setting VGL_FORCEALPHA=1 in the environment, but the readback on
your GPU is still relatively slow in general. That means that you’ll encounter
more per-frame overhead with VirtualGL. That overhead is probably not going to
be a limitation with real-world applications— 250 Megapixels/sec is still
usually faster than the image pipeline through TurboVNC, and VirtualGL reads
back the current frame while the last frame is being transported, so the
readback overhead is normally hidden— but the overhead will interfere with
synthetic benchmarks. The thing to understand about benchmarking with VirtualGL
is that OpenGL benchmarks are only measuring the performance of the
render/readback thread, but the image transport and/or X proxy are what really
determine how fast the application will “feel” from the end user’s point of
view. In other words, the most important aspect of performance is how many
frames/second actually reach the end user’s eyes, not how many frames/second
can be rendered on the server. Mouse interaction is usually limited by X11 to
40-60 Hz anyhow, so interactive applications will rarely render any faster than
that. Your goal in using a GPU is to ensure that the OpenGL rendering is at
least as fast as the mouse sampling rate, and using hardware for OpenGL
rendering means that that will be the case for larger geometries. That’s why I
recommend using ‘glxspheres64 -p {hundreds_of_thousands_or_millions}’ as a
benchmark. That benchmark clearly demonstrates the limitation of software
OpenGL in terms of its ability to keep up with the mouse sampling rate, but
that benchmark also generates a frame rate that is within realistic ranges for
interactive applications, so VirtualGL’s per-frame overhead won’t affect the
benchmark much.
> On Apr 17, 2020, at 5:21 PM, Shak <[email protected]> wrote:
>
>
> So despite my Plasma desktop being broken, I am able to use it "blind". I
> managed to run both glxspheres64 (120fps) and glmark2 (200) and gputest
> (300fps), and they all report that they use the IGD (if not with the host
> performance, apart from glxsphere64). So I guess even if I was able to run
> the DE via VGL it wouldn't make a difference to my results (which was
> expected).
>
> Here are the results from glreadtest:
>
> ==== glreadtest ====
> GLreadtest v2.6.3 (Build 20200214)
>
> /usr/bin/glreadtest -h for advanced usage.
> Rendering to Pbuffer (size = 701 x 701 pixels)
> Using 1-byte row alignment
>
> >>>>>>>>>> PIXEL FORMAT: RGB <<<<<<<<<<
> glDrawPixels(): 107.6 Mpixels/sec
> glReadPixels(): 148.3 Mpixels/sec (min = 115.4, max = 156.2, sdev = 3.569)
> glReadPixels() accounted for 100.00% of total readback time
>
> >>>>>>>>>> PIXEL FORMAT: RGBA <<<<<<<<<<
> glDrawPixels(): 124.6 Mpixels/sec
> glReadPixels(): 181.2 Mpixels/sec (min = 160.9, max = 197.7, sdev = 5.405)
> glReadPixels() accounted for 100.00% of total readback time
>
> >>>>>>>>>> PIXEL FORMAT: BGR <<<<<<<<<<
> glDrawPixels(): 107.9 Mpixels/sec
> glReadPixels(): 149.0 Mpixels/sec (min = 135.5, max = 156.1, sdev = 2.881)
> glReadPixels() accounted for 100.00% of total readback time
>
> >>>>>>>>>> PIXEL FORMAT: BGRA <<<<<<<<<<
> glDrawPixels(): 104.7 Mpixels/sec
> glReadPixels(): 142.6 Mpixels/sec (min = 125.9, max = 150.4, sdev = 3.375)
> glReadPixels() accounted for 100.00% of total readback time
>
> >>>>>>>>>> PIXEL FORMAT: ABGR <<<<<<<<<<
> glDrawPixels(): 105.0 Mpixels/sec
> glReadPixels(): 143.7 Mpixels/sec (min = 130.7, max = 154.0, sdev = 2.879)
> glReadPixels() accounted for 100.00% of total readback time
>
> >>>>>>>>>> PIXEL FORMAT: ARGB <<<<<<<<<<
> glDrawPixels(): 118.6 Mpixels/sec
> glReadPixels(): 143.7 Mpixels/sec (min = 112.5, max = 151.9, sdev = 4.444)
> glReadPixels() accounted for 100.00% of total readback time
>
> >>>>>>>>>> PIXEL FORMAT: RED <<<<<<<<<<
> glDrawPixels(): 110.2 Mpixels/sec
> glReadPixels(): 157.9 Mpixels/sec (min = 122.3, max = 187.8, sdev = 6.647)
> glReadPixels() accounted for 100.00% of total readback time
>
> FB Config = 0x6a
>
> ==== glreadtest -pbo ====
>
> GLreadtest v2.6.3 (Build 20200214)
> Using PBOs for readback
> Rendering to Pbuffer (size = 701 x 701 pixels)
> Using 1-byte row alignment
>
> >>>>>>>>>> PIXEL FORMAT: RGB <<<<<<<<<<
> glDrawPixels(): 112.2 Mpixels/sec
> glReadPixels(): 172.4 Mpixels/sec (min = 113.4, max = 208.4, sdev = 20.38)
> glReadPixels() accounted for 96.69% of total readback time
>
> >>>>>>>>>> PIXEL FORMAT: RGBA <<<<<<<<<<
> glDrawPixels(): 124.1 Mpixels/sec
> glReadPixels(): 241.5 Mpixels/sec (min = 157.6, max = 271.7, sdev = 14.43)
> glReadPixels() accounted for 0.6267% of total readback time
>
> >>>>>>>>>> PIXEL FORMAT: BGR <<<<<<<<<<
> glDrawPixels(): 107.6 Mpixels/sec
> glReadPixels(): 143.5 Mpixels/sec (min = 114.4, max = 151.3, sdev = 3.703)
> glReadPixels() accounted for 97.27% of total readback time
>
> >>>>>>>>>> PIXEL FORMAT: BGRA <<<<<<<<<<
> glDrawPixels(): 104.1 Mpixels/sec
> glReadPixels(): 247.1 Mpixels/sec (min = 197.5, max = 279.2, sdev = 13.49)
> glReadPixels() accounted for 0.6108% of total readback time
>
> >>>>>>>>>> PIXEL FORMAT: ABGR <<<<<<<<<<
> glDrawPixels(): 104.9 Mpixels/sec
> glReadPixels(): 138.8 Mpixels/sec (min = 122.6, max = 145.3, sdev = 3.135)
> glReadPixels() accounted for 96.54% of total readback time
>
> >>>>>>>>>> PIXEL FORMAT: ARGB <<<<<<<<<<
> glDrawPixels(): 120.9 Mpixels/sec
> glReadPixels(): 138.8 Mpixels/sec (min = 114.0, max = 147.7, sdev = 3.362)
> glReadPixels() accounted for 96.49% of total readback time
>
> >>>>>>>>>> PIXEL FORMAT: RED <<<<<<<<<<
> glDrawPixels(): 111.9 Mpixels/sec
> glReadPixels(): 486.6 Mpixels/sec (min = 236.9, max = 638.9, sdev = 85.43)
> glReadPixels() accounted for 1.265% of total readback time
>
> FB Config = 0x6a
>
>
>
>> On Friday, 17 April 2020 22:59:40 UTC+1, DRC wrote:
>> I honestly have no idea. I am successfully able to use your ~/gnome script
>> on my CentOS 7 and 8 machines (one has an nVidia GPU, the other AMD), as
>> long as I make the script executable. The WM launches using VirtualGL, as
>> expected.
>>
>> As far as performance, it occurred to me that the Intel GPU might have slow
>> pixel readback. Try running '/opt/VirtualGL/bin/glreadtest' and
>> '/opt/VirtualGL/bin/glreadtest -pbo' on the local display and post the
>> results. If one particular readback mode is slow but others are fast, then
>> we can work around that by using environment variables to tell VirtualGL
>> which mode to use.
>>
>> DRC
>>
>>> On 4/17/20 4:48 PM, Shak wrote:
>>> echo $LD_PRELOAD returns empty, so something is up. But my main measure of
>>> failure was that glxspheres64 (and glmark2) say that they render with
>>> llvmpipe. Given that I am using the default xstartup.turboscript, am I
>>> supposed to do something other than run vncserver -wm ~/gnome -vgl (I use a
>>> script as I can't figure out how else to pass "dbus-launch gnome-session"
>>> to -wm)?
>>>
>>> Some more benchmarks. I'm quite new to OpenGL so these were just found
>>> after some web searches. If there's obvious and useful ones I should do
>>> please let me know.
>>>
>>> gputest on host: 2600fps
>>> gputest via VNC: 370fps
>>> vglrun -sp gputest via VNC: 400fps
>>>
>>> gfxbench (car chase) on host: 44fps
>>> gfxbench (car chase) via VNC: won't run on llvmpipe
>>> vglrun gfxbench (car chase) via VNC: 28fps
>>>
>>>> On Friday, 17 April 2020 21:37:08 UTC+1, DRC wrote:
>>>> Bear in mind that passing -wm and -vgl to the vncserver script does
>>>> nothing but set environment variables (TVNC_WM and TVNC_VGL) that are
>>>> picked up by the default xstartup.turbovnc script, so make sure you are
>>>> using the default xstartup.turbovnc script. It's easy to verify whether
>>>> the window manager is using VirtualGL. Just open a terminal in the
>>>> TurboVNC session and echo the value of $LD_PRELOAD. It should contain
>>>> something like "libdlfaker.so:libvglfaker.so" if VirtualGL is active, and
>>>> you should be able to run OpenGL applications in the session without
>>>> vglrun, and those applications should show that they are using the Intel
>>>> OpenGL renderer.
>>>>
>>>> As far as the performance, you haven't mentioned any other benchmarks you
>>>> have tested, other than glmark2. I've explained why that benchmark may be
>>>> demonstrating lackluster performance. If you have other data points, then
>>>> please share them.
>>>>
>>>>> On 4/17/20 2:34 PM, Shak wrote:
>>>>> I ran the commands you suggested (I went with -p 1m) and am still seeing
>>>>> a big difference. I just find it strange to see it clearly working with
>>>>> glxspheres64, but not much else.
>>>>>
>>>>> $ glxspheres64 -p 1000000
>>>>> Polygons in scene: 999424 (61 spheres * 16384 polys/spheres)
>>>>> GLX FB config ID of window: 0xfe (8/8/8/0)
>>>>> Visual ID of window: 0x2bf
>>>>> Context is Direct
>>>>> OpenGL Renderer: llvmpipe (LLVM 9.0.1, 256 bits)
>>>>> 3.292760 frames/sec - 2.370366 Mpixels/sec
>>>>> 3.317006 frames/sec - 2.387820 Mpixels/sec
>>>>> $ vglrun -sp glxspheres64 -p 1000000
>>>>> Polygons in scene: 999424 (61 spheres * 16384 polys/spheres)
>>>>> GLX FB config ID of window: 0x6b (8/8/8/0)
>>>>> Visual ID of window: 0x288
>>>>> Context is Direct
>>>>> OpenGL Renderer: Mesa DRI Intel(R) HD Graphics P4600/P4700 (HSW GT2)
>>>>> 62.859812 frames/sec - 45.251019 Mpixels/sec
>>>>> 59.975806 frames/sec - 43.174903 Mpixels/sec
>>>>>
>>>>> BTW, GNOME is now working (where I ran the above). I'm trying to run the
>>>>> whole desktop in VGL, but vncserver -wm ~/gnome -vgl doesn't seem to do
>>>>> anything differently than it does without -vgl. Again, my gnome script is:
>>>>>
>>>>> #!/bin/sh
>>>>> dbus-launch gnome-session
>>>>>
>>>>> That said, the desktop isn't broken now so that's an improvement on KDE.
>>>>> But how can I run the whole of GNOME under VGL?
>>>>>
>>>>> I think if I can get the desktop running in VGL and still not see the
>>>>> performance in apps that I do locally (apart from in glxspheres!) I will
>>>>> take that as the most I can do with my system over VNC (unless you find
>>>>> it helpful for me to debug further).
>>>>>
>>>>> Thanks,
>>>>>
>>>>>
>>>>>> On Friday, 17 April 2020 19:04:48 UTC+1, DRC wrote:
>>>>>>> On 4/17/20 10:36 AM, Shak wrote:
>>>>>>> I ran glmark on the host display normally and then with software
>>>>>>> rendering. I've attached the results at the end of this message. I've
>>>>>>> attached this for completion rather than to contradict your hunch, but
>>>>>>> they do tie up with the numbers I see via VGL so I don't think this is
>>>>>>> a CPU/VNC issue.
>>>>>> Hmmm... Well, you definitely are seeing a much greater speedup with
>>>>>> glmark2 absent VirtualGL, so I can only guess that the benchmark is
>>>>>> fine-grained enough that it's being affected by VGL's per-frame
>>>>>> overhead. A more realistic way to compare the two drivers would be
>>>>>> using '[vglrun -sp] /opt/VirtualGL/bin/glxspheres -p {n}', where {n} is
>>>>>> a fairly high number of polygons (at least 100,000.)
>>>>>>
>>>>>>
>>>>>>> I've tried repeating my experiments using gnome, in case the issue is
>>>>>>> with KDE. However I get the following when trying to run vglrun:
>>>>>>>
>>>>>>> $ vglrun glxspheres64
>>>>>>> /usr/bin/vglrun: line 191: hostname: command not found
>>>>>>> [VGL] NOTICE: Automatically setting VGL_CLIENT environment variable to
>>>>>>> [VGL] 10.10.7.1, the IP address of your SSH client.
>>>>>>> Polygons in scene: 62464 (61 spheres * 1024 polys/spheres)
>>>>>>> libGL error: failed to authenticate magic 1
>>>>>>> libGL error: failed to load driver: i965
>>>>>>> GLX FB config ID of window: 0x6b (8/8/8/0)
>>>>>>> Visual ID of window: 0x21
>>>>>>> Context is Direct
>>>>>>> OpenGL Renderer: llvmpipe (LLVM 9.0.1, 256 bits)
>>>>>>> 17.228616 frames/sec - 17.859872 Mpixels/sec
>>>>>>> 16.580449 frames/sec - 17.187957 Mpixels/sec
>>>>>> You need to install whatever package provides /usr/bin/hostname for your
>>>>>> Linux distribution. That will eliminate the vglrun error, although it's
>>>>>> probably unrelated to this problem. (Because of the error, vglrun is
>>>>>> falsely detecting an X11-forward SSH environment and setting VGL_CLIENT,
>>>>>> which would normally be used for the VGL Transport. However, since
>>>>>> VirtualGL auto-detects an X11 proxy environment and enables the X11
>>>>>> Transport, the value of VGL_CLIENT should be ignored in this case.)
>>>>>>
>>>>>> I honestly have no clue how to proceed. I haven't observed these
>>>>>> problems in any of the distributions I officially support, and I have no
>>>>>> way to test Arch.
>>>>>>
>>>>>>
>>>>>>> I'm not sure what to make of these. I am using vncserver -wm ~/gnome,
>>>>>>> where gnome is the following script.
>>>>>>>
>>>>>>> #!/bin/sh
>>>>>>> dbus-launch gnome-session
>>>>>>>
>>>>>>> I feel that I am close but still a way off.
>>>>>>>
>>>>>>> FWIW I have previously tried using nomachine which is able to give me
>>>>>>> the perceived GL acceleration by "mirroring" my host display, but that
>>>>>>> just feels like the wrong way to achieve this (not least because it
>>>>>>> requires a monitor attached to use).
>>>>>>>
>>>>>>> Thanks,
>>>>>>>
>>>>>>> ==== RENDER TESTS ====
>>>>>>>
>>>>>>> $ glmark2
>>>>>>> =======================================================
>>>>>>> glmark2 2017.07
>>>>>>> =======================================================
>>>>>>> OpenGL Information
>>>>>>> GL_VENDOR: Intel Open Source Technology Center
>>>>>>> GL_RENDERER: Mesa DRI Intel(R) HD Graphics P4600/P4700 (HSW GT2)
>>>>>>> GL_VERSION: 3.0 Mesa 20.0.4
>>>>>>> =======================================================
>>>>>>> [build] use-vbo=false: FPS: 2493 FrameTime: 0.401 ms
>>>>>>> =======================================================
>>>>>>> glmark2 Score: 2493
>>>>>>> =======================================================
>>>>>>>
>>>>>>> $ LIBGL_ALWAYS_SOFTWARE=1 glmark2
>>>>>>> ** GLX does not support GLX_EXT_swap_control or GLX_MESA_swap_control!
>>>>>>> ** Failed to set swap interval. Results may be bounded above by refresh
>>>>>>> rate.
>>>>>>> =======================================================
>>>>>>> glmark2 2017.07
>>>>>>> =======================================================
>>>>>>> OpenGL Information
>>>>>>> GL_VENDOR: VMware, Inc.
>>>>>>> GL_RENDERER: llvmpipe (LLVM 9.0.1, 256 bits)
>>>>>>> GL_VERSION: 3.1 Mesa 20.0.4
>>>>>>> =======================================================
>>>>>>> ** GLX does not support GLX_EXT_swap_control or GLX_MESA_swap_control!
>>>>>>> ** Failed to set swap interval. Results may be bounded above by refresh
>>>>>>> rate.
>>>>>>> [build] use-vbo=false: FPS: 420 FrameTime: 2.381 ms
>>>>>>> =======================================================
>>>>>>> glmark2 Score: 420
>>>>>>> =======================================================
>>>>>>>
>>>>>>>
>>>>>>> On Thursday, 16 April 2020 23:21:59 UTC+1, DRC wrote:
>>>>>>>>
>>>>>>>>> On 4/16/20 3:19 PM, Shak wrote:
>>>>>>>>> Thank you for the quick tips. I have posted some results at the end
>>>>>>>>> of this post, but they seem inconsistent. glxspheres64 shows the
>>>>>>>>> correct renderer respectively and the performance shows the 6x
>>>>>>>>> results I was expecting. However I do not see the same gains in
>>>>>>>>> glmark2, even though it also reports the correct renderer in each
>>>>>>>>> case. Again, I see a glmark of 2000+ when running it in display :0.
>>>>>>>> I don't know much about glmark2, but as with any benchmark, Amdahl's
>>>>>>>> Law applies. That means that the total speedup from any enhancement
>>>>>>>> (such as a GPU) is limited by the percentage of clock time during
>>>>>>>> which that enhancement is used. Not all OpenGL workloads are
>>>>>>>> GPU-bound in terms of performance. If the geometry and window size
>>>>>>>> are both really small, then the performance could very well be
>>>>>>>> CPU-bound. That's why, for instance, GLXgears is a poor OpenGL
>>>>>>>> benchmark. Real-world applications these days assume the presence of
>>>>>>>> a GPU, so they're going to have no qualms about trying to render
>>>>>>>> geometries with hundreds of thousands or even millions of polygons.
>>>>>>>> When you try to do that with software OpenGL, you'll see a big
>>>>>>>> difference vs. GPU acceleration-- a difference that won't necessarily
>>>>>>>> show up with tiny geometries.
>>>>>>>> You can confirm that that's the case by running glmark2 on your local
>>>>>>>> display without VirtualGL and forcing the use of the swrast driver. I
>>>>>>>> suspect that the difference between swrast and i965 won't be very
>>>>>>>> great in that scenario, either. (I should also mention that Intel
>>>>>>>> GPUs aren't the fastest in the world, so you're never going to see as
>>>>>>>> much of a speedup-- nor as large of a speedup in as many cases-- as
>>>>>>>> you would see with AMD or nVidia.)
>>>>>>>>
>>>>>>>> The other thing is, if the benchmark is attempting to measure
>>>>>>>> unrealistic frame rates-- like hundreds or thousands of frames per
>>>>>>>> second-- then there is a small amount of per-frame overhead introduced
>>>>>>>> by VirtualGL that may be limiting that frame rate. But the reality is
>>>>>>>> that human vision can't usually detect more than 60 fps anyhow, so the
>>>>>>>> difference between, say, 200 fps and 400 fps is not going to matter to
>>>>>>>> an application user. At more realistic frame rates, VGL's overhead
>>>>>>>> won't be noticeable.
>>>>>>>>
>>>>>>>> Performance measurement in a VirtualGL environment is more complicated
>>>>>>>> than performance measurement in a local display environment, which is
>>>>>>>> why there's a whole section of the VirtualGL User's Guide dedicated to
>>>>>>>> it. Basically, since VGL introduces a small amount of per-frame
>>>>>>>> overhead but no per-vertex overhead, at realistic frame rates and with
>>>>>>>> modern server and client hardware, it will not appear any slower than
>>>>>>>> a local display. However, some synthetic benchmarks may record slower
>>>>>>>> performance due to the aforementioned overhead.
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>> In the meantime I have been trying to get the DE as a whole to run
>>>>>>>>> under acceleration. I record my findings here as a possible clue to
>>>>>>>>> my VGL issues above. In my .vnc/xstartup.turbovnc I use the following
>>>>>>>>> command:
>>>>>>>>>
>>>>>>>>> #normal start - works with llvmpipe and vglrun
>>>>>>>>> #exec startplasma-x11
>>>>>>>>>
>>>>>>>>> #VGL start
>>>>>>>>> exec vglrun +wm startplasma-x11
>>>>>>>>>
>>>>>>>>> And I also start tvnc with:
>>>>>>>>>
>>>>>>>>> $vncserver -3dwm
>>>>>>>>>
>>>>>>>>> I'm not sure if vglrun, +wm or -3dwm are redundant or working against
>>>>>>>>> each other, but I've also tried various combinations to no avail.
>>>>>>>> Just use the default xstartup.turbovnc script ('rm
>>>>>>>> ~/.vnc/xstartup.turbovnc' and re-run /opt/TurboVNC/bin/vncserver to
>>>>>>>> create it) and start TurboVNC with '-wm startplasma-x11 -vgl'.
>>>>>>>>
>>>>>>>> * -3dwm is deprecated. Use -vgl instead. -3dwm/-vgl (or setting
>>>>>>>> '$useVGL = 1;' in /etc/turbovncserver.conf or
>>>>>>>> ~/.vnc/turbovncserver.conf) simply instructs xstartup.turbovnc to run
>>>>>>>> the window manager startup script using 'vglrun +wm'.
>>>>>>>>
>>>>>>>> * Passing -wm to /opt/TurboVNC/bin/vncserver (or setting '$wm =
>>>>>>>> {script};' in turbovncserver.conf) instructs xstartup.turbovnc to
>>>>>>>> execute the specified window manager startup script rather than
>>>>>>>> /etc/X11/xinit/xinitrc.
>>>>>>>>
>>>>>>>> * +wm is a feature of VirtualGL, not TurboVNC. Normally, if VirtualGL
>>>>>>>> detects that an OpenGL application is not monitoring StructureNotify
>>>>>>>> events, VGL will monitor those events on behalf of the application
>>>>>>>> (which allows VGL to be notified when the window changes size, thus
>>>>>>>> allowing VGL to change the size of the corresponding Pbuffer.) This
>>>>>>>> is, however, unnecessary with window managers and interferes with some
>>>>>>>> of them (compiz, specifically), so +wm disables that behavior in
>>>>>>>> VirtualGL. It's also a placeholder in case future issues are
>>>>>>>> discovered that are specific to compositing window managers (+wm could
>>>>>>>> easily be extended to handle those issues as well.)
>>>>>>>>
>>>>>>>>
>>>>>>>>> Interestingly I had to update the vglrun script to have the full
>>>>>>>>> paths to /usr/lib/libdlfaker.so and the others otherwise I see the
>>>>>>>>> following in the TVNC logs:
>>>>>>>>>
>>>>>>>>> ERROR: ld.so: object 'libdlfaker.so' from LD_PRELOAD cannot be
>>>>>>>>> preloaded (cannot open shared object file): ignored.
>>>>>>>>> ERROR: ld.so: object 'libvglfaker.so' from LD_PRELOAD cannot be
>>>>>>>>> preloaded (cannot open shared object file): ignored.
>>>>>>>>>
>>>>>>>>> That said, my desktop is still broken even when these errors
>>>>>>>>> disappear.
>>>>>>>>>
>>>>>>>>> Could my various issues be to do with KDE?
>>>>>>>> The LD_PRELOAD issues can be fixed as described here:
>>>>>>>>
>>>>>>>> https://cdn.rawgit.com/VirtualGL/virtualgl/2.6.3/doc/index.html#hd0012
>>>>>>>>
>>>>>>>> All of that aside, I have not personally tested the bleeding-edge KDE
>>>>>>>> Plasma release, which is what Arch presumably ships, so I have no idea
>>>>>>>> whether it works with VirtualGL or TurboVNC. The window managers I
>>>>>>>> have tested are listed here:
>>>>>>>>
>>>>>>>> https://turbovnc.org/Documentation/Compatibility22
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>> On Thursday, 16 April 2020 20:02:13 UTC+1, DRC wrote:
>>>>>>>>>>
>>>>>>>>>> You can't really determine which OpenGL renderer is in use by just
>>>>>>>>>> looking at dlopen() calls. In a TurboVNC environment, swrast will
>>>>>>>>>> be used for any GLX/OpenGL commands sent to the TurboVNC X server
>>>>>>>>>> (the "2D X server"), and VirtualGL does send a couple of GLX/OpenGL
>>>>>>>>>> commands to the 2D X server to probe its capabilities. That's
>>>>>>>>>> probably why swrast is being loaded, but if everything is working
>>>>>>>>>> properly, the OpenGL renderer string should still report that the
>>>>>>>>>> Intel driver is in use for actual rendering. Compare the output of
>>>>>>>>>> /opt/VirtualGL/bin/glxinfo on the local display with 'vglrun
>>>>>>>>>> /opt/VirtualGL/bin/glxinfo' in TurboVNC, or just run
>>>>>>>>>> /opt/VirtualGL/bin/glxspheres64 (using vglrun in TurboVNC), which
>>>>>>>>>> reports the OpenGL renderer string as well.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On 4/16/20 10:34 AM, Shak wrote:
>>>>>>>>>>> I am trying to set up VirtualGL + TurboVNC on Arch with the Plasma
>>>>>>>>>>> KDE desktop. The host is itself a VM using an passed through Intel
>>>>>>>>>>> P4600 IGD. I believe that the passthrough itself is successful as I
>>>>>>>>>>> see GL performance when running a desktop on display :0.
>>>>>>>>>>>
>>>>>>>>>>> I am using glmark2 to check what is happening. As a measure, I get
>>>>>>>>>>> a score of around 2000 on the host, and 300 when using llvmpipe and
>>>>>>>>>>> similar when using vglrun. vglrun glinfo is reporting that its
>>>>>>>>>>> using the Intel Mesa driver (vs llvmpipe), so the set up at least
>>>>>>>>>>> looks okay, but it seems that vglrun is still using software
>>>>>>>>>>> rendering.
>>>>>>>>>>>
>>>>>>>>>>> Passing +v +tr to vglrun in both cases shows me the traces at the
>>>>>>>>>>> end of this post, which aligns with what I am seeing (highlighted
>>>>>>>>>>> yellow). I've also highlighted green some other lines which confuse
>>>>>>>>>>> me.
>>>>>>>>>>>
>>>>>>>>>>> I read this that indicated that Mesa isn't supported and in the
>>>>>>>>>>> docs that Arch's VirtiualGL package might be broken. I do not know
>>>>>>>>>>> if these apply here (or are still valid).
>>>>>>>>>>>
>>>>>>>>>>> Also when trying to accelerate the whole DE using exec vglrun
>>>>>>>>>>> plasmastart-x11 in my xstartup.turbovnc, I seem to get a broken
>>>>>>>>>>> desktop. I am not sure if this is related to the above but have
>>>>>>>>>>> mentioned it at as another data point (if its unrelated then tips
>>>>>>>>>>> to fix would be appreciated!).
>>>>>>>>>>>
>>>>>>>>>>> Thanks,
>>>>>>>>>>>
>>>>>>>>>>> vglrun traces:
>>>>>>>>>>>
>>>>>>>>>>> ==== on host ====
>>>>>>>>>>>
>>>>>>>>>>> [VGL] NOTICE: Added /usr/lib to LD_LIBRARY_PATH
>>>>>>>>>>> [VGL] Shared memory segment ID for vglconfig: 131106
>>>>>>>>>>> [VGL] VirtualGL v2.6.3 64-bit (Build 20200214)
>>>>>>>>>>> [VGL 0x92aa5780] XOpenDisplay (name=NULL dpy=0x557453a35740(:0) )
>>>>>>>>>>> 0.335932 ms
>>>>>>>>>>> [VGL] dlopen (filename=libGL.so flag=4098[VGL] NOTICE: Replacing
>>>>>>>>>>> dlopen("libGL.so") with dlopen("libvglfaker.so")
>>>>>>>>>>> retval=0x7f2c935804f0)
>>>>>>>>>>> [VGL] Opening connection to 3D X server :0
>>>>>>>>>>> [VGL] dlopen (filename=libGLX_mesa.so.0 flag=1
>>>>>>>>>>> retval=0x557453a53170)
>>>>>>>>>>> [VGL] dlopen (filename=libGLX_mesa.so.0 flag=258
>>>>>>>>>>> retval=0x557453a53170)
>>>>>>>>>>> [VGL] dlopen (filename=/usr/lib/dri/tls/i965_dri.so flag=258
>>>>>>>>>>> retval=0x00000000)
>>>>>>>>>>> [VGL] dlopen (filename=/usr/lib/dri/i965_dri.so flag=258
>>>>>>>>>>> retval=0x557453a69340)
>>>>>>>>>>> [VGL 0x92aa5780] glXGetProcAddressARB ((char
>>>>>>>>>>> *)procName=glXSwapIntervalEXT [INTERPOSED]) 0.005960 ms
>>>>>>>>>>> [VGL 0x92aa5780] glXChooseFBConfig (dpy=0x557453a35740(:0) screen=0
>>>>>>>>>>> attrib_list=[0x8012=0x0001 0x8010=0x0001 0x8011=0x0001
>>>>>>>>>>> 0x0022=0x8002 0x0008=0x0001 0x0009=0x0001 0x000a=0x0001
>>>>>>>>>>> 0x000b=0x0001 0x000c=0x0001 0x000d=0x0000 0x0002=0x0001
>>>>>>>>>>> 0x0005=0x0001 ] glxattribs=[0x8010=0x0001 0x000c=0x0001
>>>>>>>>>>> 0x000d=0x0000 0x0002=0x0001 0x0005=0x0001 0x0008=0x0001
>>>>>>>>>>> 0x0009=0x0001 0x000a=0x0001 0x000b=0x0001 0x8011=0x0001
>>>>>>>>>>> 0x0022=0x8002 ] [VGL] dlopen (filename=libGLX_mesa.so.0 flag=258
>>>>>>>>>>> retval=0x557453a53170)
>>>>>>>>>>> [VGL] dlopen (filename=/usr/lib/dri/tls/i965_dri.so flag=258
>>>>>>>>>>> retval=0x00000000)
>>>>>>>>>>> [VGL] dlopen (filename=/usr/lib/dri/i965_dri.so flag=258
>>>>>>>>>>> retval=0x557453a69340)
>>>>>>>>>>> configs[0]=0x557453b9a040(0x67) configs[1]=0x557453b9a7c0(0x6f)
>>>>>>>>>>> configs[2]=0x557453b9af40(0x77) configs[3]=0x557453b9b300(0x7b)
>>>>>>>>>>> configs[4]=0x557453b9bc60(0x85) configs[5]=0x557453b9c3e0(0x8d)
>>>>>>>>>>> configs[6]=0x557453b9bd50(0x86) configs[7]=0x557453b9c4d0(0x8e)
>>>>>>>>>>> configs[8]=0x557453b9b030(0x78) configs[9]=0x557453b9b3f0(0x7c)
>>>>>>>>>>> configs[10]=0x557453b9fa40(0xc7) configs[11]=0x557453b9fe00(0xcb)
>>>>>>>>>>> configs[12]=0x557453b9ffe0(0xcd) configs[13]=0x557453ba00d0(0xce)
>>>>>>>>>>> *nelements=14 ) 6.473064 ms
>>>>>>>>>>> [VGL 0x92aa5780] glXGetFBConfigAttrib (dpy=0x557453a35740(:0)
>>>>>>>>>>> config=0x557453b9a040(0x67) attribute=2(0x2) *value=32(0x20) )
>>>>>>>>>>> 0.008106 ms
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> ==== on tvnc ====
>>>>>>>>>>>
>>>>>>>>>>> [VGL] NOTICE: Added /usr/lib to LD_LIBRARY_PATH
>>>>>>>>>>> [VGL] Shared memory segment ID for vglconfig: 131076
>>>>>>>>>>> [VGL] VirtualGL v2.6.3 64-bit (Build 20200214)
>>>>>>>>>>> [VGL 0x9f624780] XOpenDisplay (name=NULL dpy=0x555b28562740(:1) )
>>>>>>>>>>> 2.894163 ms
>>>>>>>>>>> [VGL] dlopen (filename=libGL.so flag=4098[VGL] NOTICE: Replacing
>>>>>>>>>>> dlopen("libGL.so") with dlopen("libvglfaker.so")
>>>>>>>>>>> retval=0x7f90a00ff4f0)
>>>>>>>>>>> [VGL] Opening connection to 3D X server :0
>>>>>>>>>>> [VGL] dlopen (filename=libGLX_mesa.so.0 flag=1
>>>>>>>>>>> retval=0x555b28583a20)
>>>>>>>>>>> [VGL] dlopen (filename=libGLX_mesa.so.0 flag=258
>>>>>>>>>>> retval=0x555b28583a20)
>>>>>>>>>>> [VGL] dlopen (filename=/usr/lib/dri/tls/i965_dri.so flag=258
>>>>>>>>>>> retval=0x00000000)
>>>>>>>>>>> [VGL] dlopen (filename=/usr/lib/dri/i965_dri.so flag=258
>>>>>>>>>>> retval=0x555b285964a0)
>>>>>>>>>>> [VGL 0x9f624780] glXGetProcAddressARB ((char
>>>>>>>>>>> *)procName=glXSwapIntervalEXT [INTERPOSED]) 0.045061 ms
>>>>>>>>>>> [VGL 0x9f624780] glXChooseFBConfig (dpy=0x555b28562740(:1) screen=0
>>>>>>>>>>> attrib_list=[0x8012=0x0001 0x8010=0x0001 0x8011=0x0001
>>>>>>>>>>> 0x0022=0x8002 0x0008=0x0001 0x0009=0x0001 0x000a=0x0001
>>>>>>>>>>> 0x000b=0x0001 0x000c=0x0001 0x000d=0x0000 0x0002=0x0001
>>>>>>>>>>> 0x0005=0x0001 ] glxattribs=[0x8010=0x0001 0x000c=0x0001
>>>>>>>>>>> 0x000d=0x0000 0x0002=0x0001 0x0005=0x0001 0x0008=0x0001
>>>>>>>>>>> 0x0009=0x0001 0x000a=0x0001 0x000b=0x0001 0x8011=0x0001
>>>>>>>>>>> 0x0022=0x8002 ] [VGL] dlopen (filename=libGLX_mesa.so.0 flag=258
>>>>>>>>>>> retval=0x555b28583a20)
>>>>>>>>>>> [VGL] dlopen (filename=/usr/lib/dri/tls/swrast_dri.so flag=258
>>>>>>>>>>> retval=0x00000000)
>>>>>>>>>>> [VGL] dlopen (filename=/usr/lib/dri/swrast_dri.so flag=258
>>>>>>>>>>> retval=0x555b28705370)
>>>>>>>>>>> configs[0]=0x555b286c7170(0x67) configs[1]=0x555b286c78f0(0x6f)
>>>>>>>>>>> configs[2]=0x555b286c8070(0x77) configs[3]=0x555b286c8430(0x7b)
>>>>>>>>>>> configs[4]=0x555b286c8d90(0x85) configs[5]=0x555b286c9510(0x8d)
>>>>>>>>>>> configs[6]=0x555b286c8e80(0x86) configs[7]=0x555b286c9600(0x8e)
>>>>>>>>>>> configs[8]=0x555b286c8160(0x78) configs[9]=0x555b286c8520(0x7c)
>>>>>>>>>>> configs[10]=0x555b286ccb70(0xc7) configs[11]=0x555b286ccf30(0xcb)
>>>>>>>>>>> configs[12]=0x555b286cd110(0xcd) configs[13]=0x555b286cd200(0xce)
>>>>>>>>>>> *nelements=14 ) 44.402122 ms
>>>>>>>>>>> [VGL 0x9f624780] glXGetFBConfigAttrib (dpy=0x555b28562740(:1)
>>>>>>>>>>> config=0x555b286c7170(0x67) attribute=2(0x2) *value=32(0x20) )
>>>>>>>>>>> 0.003815 ms
>>>>>>>>>>> --
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