https://bugs.openldap.org/show_bug.cgi?id=10029
--- Comment #4 from Howard Chu hyc@openldap.org --- IMO we have no idea what a sane default is. On a large, 1024 core server, 1 million might be reasonable. On a small box like a raspberry pi, maybe only 128. It's up to sysadmins to pick sane settings, not for us to automagically determine them.