On Fri, 2021-02-12 at 14:19 -0600, Justin Forbes wrote: > > Some things, like the AMD Radeon GPU drivers, firmware or related > > code, appear to be completely non-functional on the 64k page size. > > Insufficient upstream developers are testing such issues on this > > architecture. > > Just as there are many things that expect the 64K page size. I am not > doing this.
I don't really find either of those to be compelling arguments, FWIW. If we have broken code which makes assumptions about page sizes, we should fix it. Whatever assumption it makes. We certainly *shouldn't* have assumptions like that in userspace, and we *shouldn't* need to rebuild userspace for such a change. For a long time we had 4KiB pages on ppc32 AND 64KiB pages on ppc64, and we fixed things to use getpagesize() instead of hard-coding any value at all. It's possible that we have regressions, but we should probably fix those. Once upon a time when we still supported the PS3, the 64KiB page size was fairly painful and inefficient there but IBM forced it because it apparently gave a significant performance win on boxes and workloads that they actually cared about. These days, I think the arguments for 64KiB are certainly no *less* compelling than they were then, when I conceded the change.
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