Right. The issue (AIUI) is that, right now, even though transactions are evaluated for inclusion as a group with CPFP, they're not yet evaluated for relaying as a unit, nor can they be, because the current p2p protocol doesn't have a way to send multiple transactions in a single protocol message to signify that they should be evaluated together.

On Saturday, July 11, 2015, Luke Dashjr <luke@dashjr.org> wrote:
AFAIK the only thing holding it up is lack of unit tests. If anyone would like
to implement those, I expect it'd be merged fairly soon. Then the problem is,
as Jeff mentioned, getting the parent transactions relayed despite failing
relay policy on their own.

Luke
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