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doc: release note on mempool size in -blocksonly

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Adds a release note detailing the new mempool sizing behaviour when
running in blocksonly mode, and instruction on how to override the new
defaults.
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willcl-ark 2023-01-16 20:00:03 +00:00
parent ae797463dc
commit 8e85164e7d
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Updated settings
----------------
- Setting `-blocksonly` will now reduce the maximum mempool memory
to 5MB (users may still use `-maxmempool` to override). Previously,
the default 300MB would be used, leading to unexpected memory usage
for users running with `-blocksonly` expecting it to eliminate
mempool memory usage.
As unused mempool memory is shared with dbcache, this also reduces
the dbcache size for users running with `-blocksonly`, potentially
impacting performance.