Hello VGL-team,

currently i am setting up a environment where virtualgl remotely on a 
workstation renders and sends the data to a client. So the typical VGL 
application without any fancy constellation or hardware. For this I use the 
latest VGL version 2.6.1. 
Client1: Linux Ubuntu 18.04 
Client2: Windows 10 with Linux Ubuntu 18.04 wsl and vcxsrv X server
Workstation: Linux Ubuntu 18.04, nvidia quadro

The connection can be established via vglconnect but a VGLrun only works 
via vglrun -c proxy <executable> which leads to quite low frame rates.

* vglrun +pr +v -c proxy /opt/VirtualGL/bin/glxspheres64*
*[VGL] NOTICE: Automatically setting VGL_CLIENT environment variable to*
*[VGL]    xxxxxxxx, the IP address of your SSH client.*
*Polygons in scene: 62464 (61 spheres * 1024 polys/spheres)*
*[VGL] Shared memory segment ID for vglconfig: 48562541*
*[VGL] VirtualGL v2.6.1 64-bit (Build 20190101)*
*[VGL] Opening connection to 3D X server :0*
*Visual ID of window: 0x21*
*Context is Direct*
*[VGL] Using Pbuffers for rendering*
*OpenGL Renderer: llvmpipe (LLVM 6.0, 256 bits)*
*[FBX] WARNING: MIT-SHM extension not available.  Will use X pixmap*
*[FBX]    drawing instead.*
*[VGL] Using pixel buffer objects for readback (BGR --> BGRA)*
*[VGL] NOTICE: PBO readback is not behaving asynchronously.  Disabling 
PBOs.*
*[VGL]    This could be due to a mismatch between the readback pixel format*
*[VGL]    (BGRA) and the Pbuffer pixel format (BGR).*
*[VGL]    Try setting VGL_FORCEALPHA=1.*
*Readback    -  176.59 Mpixels/sec-  158.23 fps*
*13.330503 frames/sec - 14.876841 Mpixels/sec*
*Blit        -   15.38 Mpixels/sec-   13.78 fps*
*Total       -   14.66 Mpixels/sec-   13.14 fps*
*Readback    -  184.28 Mpixels/sec-  165.13 fps*
*15.410686 frames/sec - 17.198325 Mpixels/sec*
*Blit        -   15.00 Mpixels/sec-   13.44 fps*
*Total       -   14.96 Mpixels/sec-   13.41 fps*
*Readback    -  184.09 Mpixels/sec-  164.95 fps*
*15.084290 frames/sec - 16.834067 Mpixels/sec*
*Blit        -   16.52 Mpixels/sec-   14.80 fps*
*Total       -   15.89 Mpixels/sec-   14.24 fps*
*Readback    -  187.55 Mpixels/sec-  168.06 fps*
*14.632749 frames/sec - 16.330148 Mpixels/sec*
*Blit        -   15.11 Mpixels/sec-   13.54 fps*
*Total       -   14.91 Mpixels/sec-   13.36 fps*
*Readback    -  187.72 Mpixels/sec-  168.21 fps*

using vglrun with compression (-c jpeg) it gets stuck and aborts with a 
timeout

*vglrun +pr +v +tr -c jpeg /opt/VirtualGL/bin/glxspheres64*
*[VGL] NOTICE: Automatically setting VGL_CLIENT environment variable to*
*[VGL] xxxxxxxxxxx , the IP address of your SSH client.*
*Polygons in scene: 62464 (61 spheres * 1024 polys/spheres)*
*VGL] Shared memory segment ID for cfconfig: 48529773*
*[VGL] VirtualGL v2.6.1 64-bit (Build 20190101)*
*[VGL] Opening connection to 3D X server :0*
*Visual ID of window: 0x21*
*Context is Direct*
*[VGL] Using Pbuffers for rendering*
*OpenGL Renderer: llvmpipe (LLVM 6.0, 256 bits)*
*...*
*VGL 0xf512f740] glXSwapBuffers (dpy=0x01f70930(localhost:21.0) 
drawable=0x00280002 [VGL] *
*ERROR: Could not connect to VGL client.  Make sure that cfclient is*
*[VGL] running and that either the DISPLAY or VGL_CLIENT environment*
*[VGL] variable points to the machine on which cfclient is running.*
*[VGL] ERROR: in connect--*
*[VGL] 283: Connection timed out*


VGL_CLIENT variable is not set
DISPLAY is automatically set to *localhost:21.0*

In another comparable environment this runs the virtualGL transmission with 
compression error free with frame rates in the range of 50-60fps which 
allows a smooth working on the client side. Unfortunately I have no clue 
what caused this error. i'd be happy to get some hints and help about that

Best regards

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