git: kernel - Add sequential TSC test, refactor concurrency test

[Matthew Dillon]

commit cac128231c7864434c0360660adced89b17a34d3
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Thu Jun 24 10:36:30 2021 -0700

    kernel - Add sequential TSC test, refactor concurrency test
    
    * Add a test that test the TSC, checking whether rdtsc() returns
      monotonically increasing values when hopping between CPUs.  We
      test four times from cpus 0 to (ncpus-1), and from (ncpus-1) to 0.
    
    * Revamp the TSC concurrency test.  Make the test a bit more robust
      to better adapt to HVMs.
    
    * Report all results in nanoseconds.  Example output from a
      threadripper:
    
      TSC cpu-delta test complete, 1472nS to 11281nS SUCCESS
      TSC cpu-delta test complete, 1312nS to 3386nS SUCCESS
      TSC cpu-delta test complete, 1312nS to 3526nS SUCCESS
      TSC cpu-delta test complete, 1312nS to 3396nS SUCCESS
      TSC cpu concurrency test complete, worst=320ns, avg=60ns SUCCESS

Summary of changes:
 sys/platform/pc64/isa/clock.c | 105 +++++++++++++++++++++++++++++++++++++-----
 1 file changed, 93 insertions(+), 12 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/cac128231c7864434c0360660adced89b17a34d3


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