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tests/migration: Add some slack to auto converge
There's an assert in autoconverge that checks that we quit the iteration when we go below the expected threshold. Philippe saw a case where this assert fired with the measured value slightly over the threshold. (about 3k out of a few million). I can think of two reasons: a) Rounding errors b) That after we make the decision to quit iteration we do one more sync and that sees a few more dirty pages. So add 1% slack to the assertion, that should cover a and most cases of b, probably all we'll see for the test. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
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