On Tue, Jul 30, 2013 at 07:10:03PM +0100, Chris Wilson wrote: > On Tue, Jul 30, 2013 at 09:01:22PM +0300, Ville Syrjälä wrote: > > Hmm, and what about CPU access in general? CPU doesn't know about the > > WT policy, so I'm assuming we'd need to flush after all CPU writes. > > Hmm, I had assumed the opposite. I've not yet seen signs of cache dirt. > Certainly GTT access should fine, and CPU reads. It is just those CPU > writes we need to worry about, and now I do indeed worry.
Ok, didn't take too long to force a few updates through CPU mappings to a WT display, and yes the CPU writes are incoherent. So we need to be much more careful with the flushes here. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
