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release-notes: Minor corrections and clarifications re Priority

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Luke Dashjr 2016-02-09 23:31:30 +00:00
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@ -168,33 +168,38 @@ three bytes overhead)
Relay and Mining: Priority transactions Relay and Mining: Priority transactions
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Bitcoin Core has a heuristic 'priority' based on coin value and age for Bitcoin Core has a heuristic 'priority' based on coin value and age. This
transactions which do not meet pay the minimum relay fee. Bitcoin Core relays calculation is used for relaying of transactions which do not meet pay the
and mines these transactions depending on the setting of `-limitfreerelay=<r>` minimum relay fee, and can be used as an alternative way of sorting
(default: `r=15` kB per minute) and `-blockprioritysize=<s>`. transactions for mined blocks. Bitcoin Core will relay transactions with
insufficient fees depending on the setting of `-limitfreerelay=<r>` (default:
`r=15` kB per minute) and `-blockprioritysize=<s>`.
In Bitcoin Core 0.12 when mempool limit has been reached a higher minimum relay In Bitcoin Core 0.12, when mempool limit has been reached a higher minimum
fee takes effect to limit memory usage. Transactions which do not meet this relay fee takes effect to limit memory usage. Transactions which do not meet
higher effective minimum relay fee will not be relayed or mined even if they this higher effective minimum relay fee will not be relayed or mined even if
would rank highly according to the priority heuristic if they were accepted. they rank highly according to the priority heuristic.
In Bitcoin Core 0.12 the reserved space for priority heuristic selected The mining of transactions based on their priority is also now disabled by
transactions is also set to zero. default. To re-enable it, simply set `-blockprioritysize=<n>` where is the size
in bytes of your blocks to reserve for these transactions. The old default was
To re-enable it, simply set `-blockprioritysize=<n>` where is the size in bytes 50k, so to retain approximately the same policy, you would set
of your blocks to reserve for these transactions. The old default was 50k, so `-blockprioritysize=50000`.
to retain the same policy, you would set `-blockprioritysize=50000`.
Additionally, as a result of computational simplifications, the priority value Additionally, as a result of computational simplifications, the priority value
used for transactions received with unconfirmed inputs is lower than in prior used for transactions received with unconfirmed inputs is lower than in prior
versions to due avoiding recomputing the amounts as transactions confirm. versions due to avoiding recomputing the amounts as input transactions confirm.
External miner policy set via the prioritisetransaction RPC to rank External miner policy set via the `prioritisetransaction` RPC to rank
transactions already in the mempool continues to work as it has previously. transactions already in the mempool continues to work as it has previously.
Note, however, that if mining priority transactions is left disabled, the
priority delta will be ignored and only the fee metric will be effective.
This internal automatic prioritization handling is being considered for removal This internal automatic prioritization handling is being considered for removal
entirely in Bitcoin Core 0.13. Community direction on this topic is entirely in Bitcoin Core 0.13, and it is at this time undecided whether the
particularly requested to help set project priorities. more accurate priority calculation for chained unconfirmed transactions will be
restored. Community direction on this topic is particularly requested to help
set project priorities.
Automatically use Tor hidden services Automatically use Tor hidden services
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