Maxim Kuvyrkov <maxim.kuvyr...@linaro.org> writes: > [Adding ARM maintainers to CC] > > On Oct 21, 2014, at 9:44 AM, Sebastian Pop <seb...@gmail.com> wrote: > >> Hi Maxim, >> >> Maxim Kuvyrkov wrote: >>> Thanks, benchmarking results are welcome! AArch64 doesn't use reg_pressure >>> scheduling by default. Use "-fsched-pressure >>> --param=sched-pressure-algorithm=2" to enable same thing as on ARM. I would >>> imagine C++ and Fortran floating-point code to be most affected. >> >> On aarch64 I only see perf improvements with your patch: no perf >> degradations on >> all the tests that I have run. >> >> base0: r216447, -O3 >> base1: r216447, -O3 -fsched-pressure --param=sched-pressure-algorithm=2 >> patch: r216447 + your patch, -O3 -fsched-pressure >> --param=sched-pressure-algorithm=2 >> >> patch vs. base1 is only an improvement. >> >> base1 vs. base0 has a few good improvements, and some small degradations: >> your >> patch improves the perf for one of the degradations to the point it is better >> now with -fsched-pressure --param=sched-pressure-algorithm=2 than at -O3. >> >> Could we turn on "-fsched-pressure --param=sched-pressure-algorithm=2" by >> default for aarch64? > > These are great results, yay!
+1. Thanks for running these tests. If you have time, it'd also be interesting to try the same thing with --param=sched-pressure-algorithm=1 (which should be equivalent to not having the --param, but better safe than sorry). Is algorithm 1 or algorithm 2 better for aarch64? Thanks, Richard
