[Bug 244705] /usr/src/sys/x86/x86/tsc.c: System Clock is 0.3% slow since r352684

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244705

            Bug ID: 244705
           Summary: /usr/src/sys/x86/x86/tsc.c: System Clock is 0.3% slow
                    since r352684
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: theron at freebsd.org

Created attachment 212294
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=212294&action=edit
reverts the breaking change

After switching from 12.1-RELEASE to CURRENT I noticed audio driver appeared to
be consuming samples too fast by about 0.3%.  However after verifying audio
devices are working properly I discovered that system clock is actually slow by
0.3% (confirmed by using ntpdate to compare with time server).

This is not a hardware fault since I can reliably get correct clock by booting
12.1-RELEASE or CURRENT r352683 but slow clock with CURRENT since r352684
unless reverting that change.

hw.model: Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz.

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