The orphan pool has nontrivial denial of service properties around transaction validation. In general, I think the goal has been to reduce/remove it, not the other way around. In any case, this is likely the wrong forum for software-level discussion of Bitcoin Core. For that, you probably want to open an issue on github.com/bitcoin/bitcoin.
Matt > On Feb 1, 2020, at 14:12, Anas via bitcoin-dev > <[email protected]> wrote: > > > Hi all, > > This paper - https://arxiv.org/pdf/1912.11541.pdf - characterizes orphan > transactions in the Bitcoin network and shows that increasing the size of the > orphan pool reduces network overhead with almost no additional performance > overhead. What are your thoughts? > > Abstract: >> Orphan transactions are those whose parental income-sources are missing at >> the time that they are processed. These transactions are not propagated to >> other nodes until all of their missing parents are received, and they thus >> end up languishing in a local buffer until evicted or their parents are >> found. Although there has been little work in the literature on >> characterizing the nature and impact of such orphans, it is intuitive that >> they may affect throughput on the Bitcoin network. This work thus seeks to >> methodically research such effects through a measurement campaign of orphan >> transactions on live Bitcoin nodes. Our data show that, surprisingly, orphan >> transactions tend to have fewer parents on average than non-orphan >> transactions. Moreover, the salient features of their missing parents are a >> lower fee and larger size than their non-orphan counterparts, resulting in a >> lower transaction fee per byte. Finally, we note that the network overhead >> incurred by these orphan transactions can be significant, exceeding 17% when >> using the default orphan memory pool size (100 transactions). However, this >> overhead can be made negligible, without significant computational or memory >> demands, if the pool size is merely increased to 1000 transactions. > > Regards, > Anas > _______________________________________________ > bitcoin-dev mailing list > [email protected] > https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
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