big.LITTLE status for rk3399/rockpro64?

[Josh Howard]

On Thu, 30 Jul 2020 09:02:56 -0700,
William Carson via freebsd-arm wrote:
> 
> 
> > On Jul 28, 2020, at 10:43 AM, Vincent Milum Jr <freebsd-arm at darkain.com> wrote:
> > 
> > The downside is that the two big cores are not fully clocking up to their max
> > speed, because FreeBSD doesn't have support yet to clock cores or groups of
> > cores independently.
> 
> Is this true? I'm running r363091 on a RockPro64 with sysutils/powerdxx and it
> supports the different frequencies just fine:
> 
> # sysctl dev.cpu.{0,1,2,3,4,5}.freq
> dev.cpu.0.freq: 1416
> dev.cpu.1.freq: 1416
> dev.cpu.2.freq: 1416
> dev.cpu.3.freq: 1416
> dev.cpu.4.freq: 1800
> dev.cpu.5.freq: 1800

powerdxx definitely does help. I think the other issue is that if you set ncpu=4,
you get get the max freq_levels of 1512 for the 4 CPUs, but when all 6 are
enabled, it finds the highest common freq, which is 1416. Furthermore, we only
set the big cores at 1800, but they should be 2016.