I got it fixed. First, we have to make sure that the user inside lxc container
belongs to the group video. To do this, do the following: ( assuming user
is named ubuntu )
sudo usermod -a -G video ubuntu
Then, add the following in the container config file i.e.
/var/lib/lxc/mk7i_container/config. My container name is mk7i_container.
#Video DRI
lxc.cgroup.devices.allow = c 226:* rwm
##/dev/dri mounts
lxc.mount.entry = /dev/dri dev/dri none bind,optional,create=dir
Now, restart the container. And the graphics should work fine.
>
> -- Forwarded message --
> From: manik sheeri <sheeri185adi...@gmail.com>
> To: lxc-users@lists.linuxcontainers.org
> Cc:
> Date: Thu, 22 Sep 2016 14:53:59 -0700
> Subject: [lxc-users] slow game graphics in lxc container
> I have a privileged `lxc` container running on Ubuntu 16.0.4 LTS.
>
> I have noticed that the graphics of our game are very sluggish in
> container compared to when running on host directly.
>
> Could anyone point a reference as to what could be the cause ?
>
> So I ran `glxgears` application inside the container. Though the
> application ran fine but I saw the following info + errors on console:
>
> libGL error: failed to open drm device: Permission denied
> libGL error: failed to load driver: nouveau
> 4057 frames in 5.0 seconds = 811.356 FPS
> 4238 frames in 5.0 seconds = 847.557 FPS
> 4251 frames in 5.0 seconds = 850.081 FPS
> 4254 frames in 5.0 seconds = 850.743 FPS
> 4253 frames in 5.0 seconds = 850.431 FPS
> 4255 frames in 5.0 seconds = 850.949 FPS
> 4253 frames in 5.0 seconds = 850.450 FPS
> 4254 frames in 5.0 seconds = 850.733 FPS
> 4250 frames in 5.0 seconds = 849.960 FPS
> 4247 frames in 5.0 seconds = 849.254 FPS
> 4246 frames in 5.0 seconds = 849.129 FPS
>
>
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