Re: [PATCH v4 09/10] tests/qtest: make more migration pre-copy scenarios run non-live

[Juan Quintela]

Daniel P. Berrangé <berrange@redhat.com> wrote:
> There are 27 pre-copy live migration scenarios being tested. In all of
> these we force non-convergence and run for one iteration, then let it
> converge and wait for completion during the second (or following)
> iterations. At 3 mbps bandwidth limit the first iteration takes a very
> long time (~30 seconds).
>
> While it is important to test the migration passes and convergence
> logic, it is overkill to do this for all 27 pre-copy scenarios. The
> TLS migration scenarios in particular are merely exercising different
> code paths during connection establishment.
>
> To optimize time taken, switch most of the test scenarios to run
> non-live (ie guest CPUs paused) with no bandwidth limits. This gives
> a massive speed up for most of the test scenarios.
>
> For test coverage the following scenarios are unchanged
>
>  * Precopy with UNIX sockets
>  * Precopy with UNIX sockets and dirty ring tracking
>  * Precopy with XBZRLE
>  * Precopy with UNIX compress
>  * Precopy with UNIX compress (nowait)
>  * Precopy with multifd
>
> On a test machine this reduces execution time from 13 minutes to
> 8 minutes.
>
> Tested-by: Thomas Huth <thuth@redhat.com>
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

Reviewed-by: Juan Quintela <quintela@redhat.com>