Re: [RFC][RFT][PATCH 0/3] arm64: Enable asympacking for minor CPPC asymmetry

[Andrea Righi]

Hi Christian,

On Thu, Mar 26, 2026 at 03:55:54PM +0000, Christian Loehle wrote:
...
> > Right, the issue I'm trying to solve is SD_ASYM_CPUCAPACITY + SMT. Removing
> > SD_ASYM_CPUCAPACITY from the equation fixes my issue, because we fall back
> > into the regular idle CPU selection policy, which avoids allocating both
> > SMT siblings when possible.
> > 
> > Thanks,
> > -Andrea
> 
> Could you also report how Grace baseline vs ASYM_PACKING works for your
> benchmark? (or Vera nosmt)
> 

I've done some tests with Vera nosmt. I don't see much difference with
ASYM_PACKING vs ASYM_CPUCAPACITY (baseline), pretty much in error range (I
see around 1-2% difference across runs, but there's not a clear bias
between the two solutions).

I'll try to find a Grace system and repeat the tests there as well.

Thanks,
-Andrea