K, did significant poking.
native_calibrate_cpu is getting precidence no matter what because on SKL
server, native_calibrate_tsc is always returning zero (Note that there is a
caveat 2 lines down).
In native_calibrate_tsc, I'm seeing it always return zero after the `switch
(boot_cpu_data.x86_model)`. crystal_khz is zero so it rolls through that,
never assigns it.
Now I'm apparently not testing on production CPU's. I've requested that they
drop em' in so I can ensure `CPUID 15H TSC/Crystal ratio` doesn't differ
between the ES and Prod silicon, since that will effect the math
Anyways, Then after calibrate is found to be zero, it's utilizing the CPUID
calculation from native_calibrate_cpu for tsc_khz since that's returning a
'proper' value when it does the reassignment:
---
if (tsc_khz == 0) /* Hits here and reassigns tsc_khz to the cpuid
calculation. */
tsc_khz = cpu_khz;
else if (abs(cpu_khz - tsc_khz) * 10 > tsc_khz)
cpu_khz = tsc_khz;
---
I'll post another update when I've checked with Prod CPU's, /probably/ tomorrow.
