A few people mention it in the Raptor forums[2]
If there are actually many other page size issues with amdgpu (or other drivers), then
from what I can see the raptor/power9 community is unfortunately not reporting these
problems upstream which makes it difficult for the developers to be aware of them.
Right now I don't have a spare machine for reboots, testing
kernel and
hardware issue like that. I try to keep the machine as stable as
possible. If I can generate revenue from doing POWER9-specific work
then I would be happy to have more of these machines.
Also, I don't have one of the Radeon Navi GPUs anyway, I defer buying
one until I can get the new Radeon RX6800 XT. They were launched in
November but there is still no stock here. If anybody knows how to get
them for development then I can get a head start on these issues.
The bug report I linked mentioned a RX Vega 56, which was released in ~2017. I don't
think a Navi card is required to reproduce the problem.
Its not just about me though: I'm sure that if other people buy
these
workstations too, that will spread the workload a lot more. Many hands
make light work. As long as the number of developers on the platform is
limited, we have to focus our efforts.
For example, once we go back to 4k page size, we can divide and conquer:
any bugs that remain are not page size bugs and we can concentrate on
fixing those first. After making good progress there, we could try 64k
again.
It's a bit concerning that the power9 community isn't already actively reporting
bugs upstream and working to resolve these issues. All niche desktop platforms need at
least a few people to really step up and put in work to test, report, and help fix bugs.
Right now it appears that the desire to move to 4k pages is in large part motivated by a
lack of people willing and able to file bug reports and assist developers (e.g. bisect).
I hope I am wrong, but I have not seen anyone bisect an issue in the power9-related amdgpu
bug reports. This doesn't bode well for getting desktop-related power9 issues fixed,
whether or not it is due to a non-4k page size.
My fear is that this is to some degree going against the ethos of Fedora by making a
change solely to route around problems upstream rather than engaging with upstream to get
the actual issues resolved.
> Regards,
>
> Daniel
>
> 2.
https://forums.raptorcs.com/index.php/topic,100.msg1318.html#msg1318