In this thread, I outlined an idea for reducing cost of WAL CRC checking
http://archives.postgresql.org/pgsql-hackers/2006-10/msg01299.php
wal_checksum = on (default) | off
Recovery can occur with/without same setting of wal_checksum, to avoid
complications from crashes immediately after turning GUC on.
Patch enclosed here against CVS HEAD, passes make check.
Useful reduction in CPU for both normal operation and recovery.
--
Simon Riggs
EnterpriseDB http://www.enterprisedb.com
