Re: Regression caught by replay_kernel.py:ReplayKernelNormal.test_aarch64_virt

[Cleber Rosa <crosa@redhat.com>]

On Tue, Jul 27, 2021 at 9:48 AM Peter Maydell <peter.maydell@linaro.org> wrote:
>
> On Tue, 27 Jul 2021 at 14:24, Cleber Rosa <crosa@redhat.com> wrote:
> > Yes, I've spent quite some time with some flaky behavior while running
> > the replay tests as well. But in the end, the test remained unchanged
> > because we found the issues in the actual code under test (one time
> > the recording of the replay file would sometimes be corrupted when
> > using >=1 CPUs, but 100% of the time when using a single CPU).
> >
> > This time, it was failing 100% of the time in my experience, and now,
> > after the fix in df3a2de51a07089a4a729fe1f792f658df9dade4, it's
> > passing 100% of the time.  So I guess even tests with some observed
> > flakiness can have their value.
>
> To me they have very little value, because once I notice a test
> is flaky I simply start to ignore whether it is passing or failing,
> and then it might as well not be there at all.
> (This is happening currently with the gitlab CI tests, which have
> been failing for a week.)
>
> -- PMM
>

I hear you... and I acknowledge that we currently don't have a good
solution for keeping track of the test results data and thus going
beyond one's perceived value of a test.

It's not something for the short term, but I do plan to work on a
"confidence" tracker for tests.  There is some seed work in the CKI
data warehouse project[1] but it's very incipient.

- Cleber.

[1] - https://gitlab.com/cki-project/datawarehouse/-/blob/main/datawarehouse/views.py#L158