tsc failed on T-aws 4.4 i3.metal

[Po-Hsu Lin]

This test is only failing on i3.metal.

Reproduce rate: 3 out of 3 attempts

Failed with:
  TestFail: Latency CPU 66 - CPU 37 = 706 exceeds threshold 650

Test history on i3.metal:
* 4.4.0-1057.61 - passed
* 4.4.0-1056.60 - passed
* 4.4.0-1055.59 - passed

 Running 'make '
 [stdout] cc -O -Wall -Wpedantic -Werror -c -o checktsc.o checktsc.c
 [stdout] cc -o checktsc checktsc.o -lpthread
 Running '/home/ubuntu/autotest/client/tmp/tsc/src/checktsc -t 650'
 Program checktsc exit status is 1
 Exception escaping from test:
Traceback (most recent call last):
  File "/home/ubuntu/autotest/client/shared/test.py", line 411, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/home/ubuntu/autotest/client/shared/test.py", line 823, in _call_test_function
    return func(*args, **dargs)
  File "/home/ubuntu/autotest/client/shared/test.py", line 291, in execute
    postprocess_profiled_run, args, dargs)
  File "/home/ubuntu/autotest/client/shared/test.py", line 212, in _call_run_once
    self.run_once(*args, **dargs)
  File "/home/ubuntu/autotest/client/tests/tsc/tsc.py", line 74, in run_once
    raise error.TestFail(reason)
TestFail: Latency CPU 66 - CPU 37 = 706 exceeds threshold 650
 child process failed

[Kleber Sacilotto de Souza (kleber-souza)]

Talking offline to Thadeu Cascardo the conclusion was that this is not a bug in the kernel.