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

Responses

• Re: wal_checksum = on (default) | off at 2007-01-04 15:00:56 from Tom Lane

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