Re: [PATCH v3 8/9] 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-convergance 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 convergance
> 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.
>
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

Hi

I have a different idea to get the migration tests faster.  Namely, just
stop letting enter the completation stage until we are ready to use it.

I need that functionality also for vfio migration, so as I have to
create the patches, can we put on hold the last two patches and give me
a couple of days?

Thomas, do you care if I get the whole sets of patches through the
migration tree?  Almost everything is migration related, and I am
changing the same files that Daniel, so it is easier if I can get them
into my tree.

Later, Juan.