Hi Ramana, > Can you see what happens with the Cortex-A8 or Cortex-A9 schedulers to > spread the range across some v7-a CPUs as well ? While they aren't that > popular today I > would suggest you look at them because the defaults for v7-a are still to use > the > Cortex-A8 scheduler and the Cortex-A9 scheduler might well also get used in > places given > the availability of hardware.
The results are practically identical to Cortex-A53 and A57 - there is a huge codesize win across the board on SPEC2006, there isn't a single benchmark that is larger (ie. more spilling). > I'd be happy to move this forward if you could show if there is no *increase* > in spills > for the same range of benchmarks that you are doing for the Cortex-A8 and > Cortex-A9 > schedulers. There certainly isn't. I don't think results like these could be any more one-sided, it's a significant win for every single benchmark, both for codesize and performance! What isn't clear is whether something has gone horribly wrong in the scheduler which could be fixed/reverted, but as it is right now I can't see it being useful at all. This means we should also reevaluate whether pressure scheduling now hurts AArch64 too. Cheers, Wilco
