On Thu, 7 Jan 2021 18:00:42 +0000 Peter Robinson <pbrobinson@xxxxxxxxx> wrote: > On Thu, Jan 7, 2021 at 3:24 PM Neal Gompa <ngompa13@xxxxxxxxx> wrote: > > > > On Thu, Jan 7, 2021 at 10:10 AM Daniel Pocock <daniel@xxxxxxxxxx> wrote: > > > > > > > > > > > > On 07/01/2021 12:35, Dan Horák wrote: > > > > Hi Daniel, > > > > > > > > On Wed, 6 Jan 2021 14:11:37 +0100 > > > > Daniel Pocock <daniel@xxxxxxxxxx> wrote: > > > > > > > >> > > > >> We did some more troubleshooting of AMD Radeon issues on ppc64 > > > >> > > > >> As with Nouveau, it looks like a change from 64k to 4k page size got it > > > >> working again with RX 5700. I suspect it will be similar for RX 6800 if > > > >> we can get some of them, they are a good complement for the compute power. > > > >> > > > >> The issue is page size, not ppc64 > > > > > > > > are you talking about Maurizio's issue? When I was talking with the guy > > > > who fixed the Navi 10 driver for Power, he wasn't aware of any page > > > > size issues. But it sounds plausible. > > > > > > > > > Yes, it is in the Raptor forum > > > > > > To save reading, I gave him the following in an apt repository: > > > > > > - 5.9.6 kernel with 4k page size > > > - mesa 20.3 > > > - deps for mesa (llvm-11, libdrm, ...) > > > > > > He took the 2020-10-22 firmware snapshot from Debian unstable > > > > > > He disabled Wayland, to use Xorg > > > > > > It worked. > > > > > > I'm hoping that exactly the same set of packages will work for me > > > whenever I can get my hands on an RX 6800 XT card. > > > > > > As mentioned elsewhere in this thread and in various parts of the Raptor > > > forum, especially this[1] thread, there are a range of applications > > > where page size appears to have some impact. > > > > > > I'd like to emphasize that there are a range of issues where page size > > > does not appear to be a factor, there are a backlog of these issues. > > > Therefore, emphasizing this quite strongly, I feel it is better for > > > people to run 4k page size on workstations from F-34 so we can clearly > > > flush out the PPC issues on 4k before we even begin to address issues > > > with 64k. As examples, I have issues with Blender[2], Firefox[3] and > > > JPEGs in OBS[4] where page size has been eliminated but I also have > > > another issue[5] with Firefox, or maybe v4l2-loopback, where page size > > > is a factor. > > > > > > Vikings and Raptor hope to sell a lot more of these systems when they go > > > live in 2021. Vikings in particular has put great effort into a > > > German-engineering water cooling solution, there is a leaked photo in > > > the Raptor forum. Personally, I already identified the traps in this > > > platform within hours of unboxing but I know a lot of the users, > > > including Fedora users, will benefit from a slightly softer landing on > > > POWER9. I can't personally spend time following every issue through to > > > completion myself (unless somebody wants to offer me a bounty) but I try > > > to document them as well as I can both here and in the bug trackers. > > > > > > > You could make a Change proposal to switch Fedora on POWER back to 4k > > page sizes. Or just talk to the Fedora kernel maintainers about > > switching it back. We did this four years ago for ARM (as Peter > > noted), and if it really continues to be a problem for desktop > > POWER systems, then switching back makes sense. > > The arm team made that change by engaging with all the people that > would be impacted after working with the toolchain teams to ensure the > userspace had all the needed fixes to ensure it was purely a kernel > config change, that was around 18 months work to get to that point > (yes, and POWER64 likely benefits from that ~ 10 releases later) but > the likes of IBM should be engaged because they obviously also have an > interest and are active users/contributors of Fedora on POWER. I'm talking with them, Dan _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx
