On 1/25/21 8:27 PM, Helge Deller wrote: > On 1/23/21 4:39 PM, Rolf Eike Beer wrote: >> The Python testsuite in all versions of Python3 I remember fails the eintr >> tests with output like this: >> >> FAIL: test_poll (__main__.SelectEINTRTest) >> ---------------------------------------------------------------------- >> Traceback (most recent call last): >> File "/usr/lib/python3.9/test/eintrdata/eintr_tester.py", line 451, in >> test_poll >> self.assertGreaterEqual(dt, self.sleep_time) >> AssertionError: 0.19999999995343387 not greater than or equal to 0.2 > > There have been some changes in the generic timekeeping functions. > I see timing issues on a few of my machines too, e.g. in the xor > time measurement functions as reported at lkml. One more idea: You could try to enable CONFIG_DEBUG_TIMEKEEPING. > >> There are 2 more failing tests with likewise output. This happens on my 4-core >> C8000. I have attached the testcase, when running it with "python3 >> test_eintr.py" I also get that results. >> >> I suspect this could be some cross-cpu clock scew, but of course it can be >> something entirely different. Could someone have a look what is up there? >> Kernel is currently 5.10.4, but this has been there for a while. >> >> Eike >> > >
