On Thursday, January 15, 2015 08:56:23 AM Ben Widawsky wrote: > On Thu, Jan 15, 2015 at 01:41:14AM -0800, Kenneth Graunke wrote: > > There's some debate about whether we should use Meta or BLORP, > > but either should run circles around the BLT engine. > > > > Improves performance in "copypixrate -blit -back" (from Mesa demos) > > by 232.037% +/- 3.15795% (n=10) on Broadwell GT3e. > > > > Signed-off-by: Kenneth Graunke <[email protected]> > > --- > > src/mesa/drivers/dri/i965/intel_fbo.c | 14 +++++++------- > > 1 file changed, 7 insertions(+), 7 deletions(-) > > > > Ben: this might be a good candidate for your braswell branch. > > > > I'll give it a run through the benchmarks assuming I can get a working > machine. > I am always concerned about this kind of switch because it seems very > benchmark > dependent to me. If we happen to have benchmarks which are extremely GPU/RCS > limited, I could only imagine this would hurt, for example. > > Anyway, I'll let the data speak for itself when I have it. Thanks for giving > me > new things to try.
I doubt that it's very benchmark dependent. In every case that we've looked at, the BLT has proven to be slightly slower to massively slower. I've never seen it be faster. --Ken
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