Re: [PATCH] tests/migration: Allow longer timeouts

[Thomas Huth]

On 08/10/2020 18.03, Dr. David Alan Gilbert (git) wrote:
> From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
> 
> In travis, with gcov and gprof we're seeing timeouts; hopefully fix
> this by increasing the test timeouts a bit, but for xbzrle ensure it
> really does get a couple of cycles through to test the cache.
> 
> I think the problem in travis is we have about 2 host CPU threads,
> in the test we have at least 3:
>    a) The vCPU thread (100% flat out)
>    b) The source migration thread
>    c) The destination migration thread
> 
> if (b) & (c) are slow for any reason - gcov+gperf or a slow host -
> then they're sharing one host CPU thread so limit the migration
> bandwidth.
> 
> Tested on my laptop with:
>    taskset -c 0,1 ./tests/qtest/migration-test -p /x86_64/migration
> 
> Reported-by: Alex Bennée <alex.bennee@linaro.org>
> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> ---
>  tests/qtest/migration-test.c | 21 +++++++++++----------
>  1 file changed, 11 insertions(+), 10 deletions(-)

This seems to fix the gcov/gprof test indeed:

 https://travis-ci.com/github/huth/qemu/jobs/398270396

Thus:

Tested-by: Thomas Huth <thuth@redhat.com>

I'm also queuing this to my qtest-next branch (in case you don't plan a
migration pull request within the next days):

 https://gitlab.com/huth/qemu/-/commits/qtest-next/

 Thomas