On 05.02.2015 13:54, Ilia Mirkin wrote: > On Wed, Feb 4, 2015 at 11:45 PM, Michel Dänzer <mic...@daenzer.net> wrote: >> On 05.02.2015 12:48, Ilia Mirkin wrote: >>> Is there a benchmark that demonstrates this? I'd like to test it out >>> with nouveau. >> >> Mesa demos src/tests/streaming_rect on Kaveri (radeonsi): >> >> Unpatched: 42 frames in 1.023 seconds = 41.056 FPS >> Patched: 615 frames in 1.000 seconds = 615.000 FPS > > Hm, 260fps for me on a GF108 (nvc1) with or without the patch (with > vblank_mode=0 LIBGL_DRI3_DISABLE=1). I guess with nouveau you don't > get that uncacheable nonsense?
I guess so, but note that the 'uncacheable nonsense' (i.e. write-combining for CPU mappings of BOs in GART) accounts for about half of the extra boost I'm getting with Fredrik's patches. Anyway, if you look at the description of PIPE_USAGE_* in src/gallium/docs/source/screen.rst, PIPE_USAGE_STAGING is the only one which can be expected to be fast for CPU reads. -- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Mesa and X developer _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
