Kenneth Graunke <kenn...@whitecape.org> writes: > Data port reads are absurdly slow on Ivybridge due to cache issues. > > The LD message ignores the sampler unit index and SAMPLER_STATE pointer, > instead relying on hard-wired default state. Thus, there's no need to > worry about running out of sampler units or providing SAMPLER_STATE; > this small patch should be all that's required. > > NOTE: This is a candidate for all release branches. > > Signed-off-by: Kenneth Graunke <kenn...@whitecape.org> > --- > src/mesa/drivers/dri/i965/brw_fs.h | 3 +++ > src/mesa/drivers/dri/i965/brw_fs_emit.cpp | 36 > ++++++++++++++++++++++++++++++- > 2 files changed, 38 insertions(+), 1 deletion(-) > > I did this a long time ago for VS pull constant loading, which resulted in > a 2-5x speedup for certain benchmarks. Apparently at the time I never got > FS pull constant loading working, and didn't have a benchmark that needed > it, so I never finished and pushed it. > > Now I have a game that needs it. No concrete data as I haven't figured out > how to get consistent FPS numbers out of it.
I'd rather hold off for some numbers, and I object to cherry-picking performance patches to release branches.
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