There is a test that assumes that the backlog will get overrun, but
because of the recent changes to the default it no longer fails. It
seems like it is a bit flakey now though, so resetting the value in the
test back to 1mb. (This relates to the CoB of 1100k. So it should
consistently work with a 1mb limit).
Signed-off-by: Madelyn Olson <madelyneolson@gmail.com>