On (23/08/03 17:32), Dusty Mabe wrote: > >>>> zram: simplify bvec iteration in __zram_make_request > >>>> > >>>> bio_for_each_segment synthetize bvecs that never cross page boundaries, so > >>>> don't duplicate that work in an inner loop. > >>> > >>>> Any ideas on how to fix the problem? > >>> > >>> So the interesting cases are: > >>> > >>> - ppc64 usually uses 64k page sizes > >>> - ppc64 is somewhat cache incoherent (compared to say x86) > >>> > >>> Let me think of this a bit more. > >> > >> Would need to be confirmed first that 64k pages really are in use > >> (eg we compile ppc64le with 4k page sizes ...). > >> Dusty? > >> For which page size did you compile your kernel? > > > > > > For Fedora the configuration is to enable 64k pages with CONFIG_PPC_64K_PAGES=y > > https://src.fedoraproject.org/rpms/kernel/blob/064c1675a16b4d379b42ab6c3397632ca54ad897/f/kernel-ppc64le-fedora.config#_4791 > > > > I used the same configuration when running the git bisect. > > Naive question from my side: would this be a candidate for reverting while we investigate the root cause? That's certainly a possible solution. But I don't quite understand why af8b04c63708 doesn't work.
