Re: linux-c7 and opengl apps?

On Wed, Oct 3, 2018 at 5:40 PM Johannes Lundberg <johalun0_at_gmail.com> wrote:

> Hi
>
> Have anyone successfully run opengl apps with linux-c7?
>
> Linux opengl apps works great with linux-c6 on gpu < kabylake but
> linux-c6-dri does not include support for kabylake gpus.
> Linux glxinfo in c7 show support for hardware rendering on kabylake but any
> attempt to run an opengl app results in application seg fault or other
> crash (I believe this is also the case with skylake gpus on linux-c7).
>
> Is there any way to run gdb on linux apps/core dumps?
>
> /Johannes
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Highly unlikely since the Linux kernel memory model is pretty different
than FreeBSD especially concerning graphics.

Linux kernel graphics will have to use dma regions or the low kernel memory
while most other stuff hangs out in the high kernel memory.

Since the graphics drivers have to have contiguous memory regions that
should not be swapped out, if linuxkpi doesn't manage these complexities
you'll continue to random failures especially around sleep to wake, context
switching and power management.

It can be fixed though, you'll just need to port the entire Linux memory
architecture to FreeBSD and that's as it stands right now.

Don't look into rma, numa, hhm, huge pages and all the other lovely memory
features that is currently mainline or about to get merged into mainline.

Good luck with that though.

Best,
Owen