[Bug 299404] clock rate scaling not fully supported on modern (gen 13+) intel amd64 chips

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=299404

            Bug ID: 299404
           Summary: clock rate scaling not fully supported on modern (gen
                    13+) intel amd64 chips
           Product: Base System
           Version: 15.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: david@dcrosstech.com

Running FreeBSD on modern intel (generation 13+) CPUs does not allow the full
clock rate to be achieved.  Worse when running CPU intensive tasks on multiple
cores it will actually SLOW DOWN all of the cores.  Running on a single core
will increase the clock, but not to the full amount.  It feels like thermal
throttling, but temperature as reported under dev.cpu in both absolute
temperature and throttle_log shows no events.  Manually increasing the fan
speed will additionally cool the CPUs further, but still no increase in
temperature.

I have seen this on at least a Lenovo P16s and an AMD ASUS NUC14.

NUC14: Intel(R) Core(TM) 3 N355 (1881.60-MHz K8-class CPU
Lenovo p16s: 13th Gen Intel(R) Core(TM) i7-1360P (2611.20-MHz K8-class CPU)

I have tried adjusting the EST priority with marginal results, it seems to
scale up faster but doesn't seem to dramatically affect the overall
performance.

-- 
You are receiving this mail because:
You are the assignee for the bug.