> We do have the set_caching ioctl. It's enough to flip the PTEs to UC and > let MOCS manage things. I actually did a few experiments on my IVB. I > made all Mesa's buffers UC via PTEs by patching libdrm to change the > cache mode of each bo after allocation. Then I fiddled with the MOCS > LLC bits in various ways. It definitely has an effect, sometimes making > things slower, sometimes faster. xonotic again seemed to benefit. IIRC > leaving everything LLC uncached was actually the fastest (w/ high quality > at least) so we may be thrashing the LLC a bit there. But eg. reaction > quake regressed quite a lot if most things were left as UC.
Can you share the libdrm patch? _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
