I wrote:
You probably need to fix the max-connections pass so that it applies the
same changes to max_fsm_pages as the second pass does --- otherwise, its
assumption that shared_buffers can really be set that way will be wrong.
Other than that I didn't see any problem with the shared_buffers part of
the patch.
revised patch attached, leaving max_connections alone except as above.
committed, along with minor docs change.
The open question is whether to try more connections, on some or all
platforms.
cheers
andrew
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