Benjamin Herrenschmidt <b...@kernel.crashing.org> wrote on 15/10/2009 03:12:50:
> > On Wed, 2009-10-14 at 18:08 -0700, Rex Feany wrote: > > Thus spake Benjamin Herrenschmidt (b...@kernel.crashing.org): > > > > > On Wed, 2009-10-14 at 17:41 -0700, Rex Feany wrote: > > > > The biggest problem for me turned out to be the MMU context IDs being > > > > clamped to 32 when the 8xx only has 16. With this, things are a bit more > > > > stable :) > > > > > > This is with Joakim patches or without ? > > > > with just one: adding tlbil_va() to do_page_fault(). > > Ah cool, at least that keeps my sanity, I didn't get how it could work > at all without that bit :-) > > Scott, Joakim: It will be interesting to figure out exactly what is the > condition where that is necessary. It definitely should make the one > in set_pte_filter() or ptep_set_access_flags_filter() unnecessary. > > Joakim, you mentioned increased amount of TLB errors or misses when > doing that too often, that sounds a bit weird and worth investigating I didn't say that, did I? More like: if I don't do tlbil_va at all I get a lot of extra/duplicate TLB errors for the same address. Adding the patch makes these go away. I guess one could do tlbil_va unconditionally but I didn't see any improvements from doing that, but this was all on 2.4 > > Finally we could implement preload from update_mmu_cache() but that's a > different matter alltogether. > > Cheers, > Ben. > > > > _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
