I see.

But is it really necessary to soft fork over this issue?  Why not just make
it a relay rule?  Miners are already incentivized to modify transactions to
drop excess witness data and/or prioritize (versions of) transactions based
on their cost.  If a miner wants to mine a block with excess witness data,
it is mostly their own loss.

On Tue, Aug 16, 2016 at 6:39 PM, Pieter Wuille <pieter.wuille@gmail.com>
wrote:

> On Aug 17, 2016 00:36, "Russell O'Connor" <roconnor@blockstream.io> wrote:
>
> > Can I already do something similar with replace by fee, or are there
> limits on that?
>
> BIP125 and mempool eviction both require the replacing transaction to have
> higher fee, to compensate for the cost of relaying the replaced
> transaction(s).
>
> --
> Pieter
>