Comment 4 for bug 1018307

The 512 MB is an upstream default, the packages don't change it.

(http://www.postgresql.org/docs/9.1/static/runtime-config-connection.html)

However, it does not seem very bad to set it to 0. I'm mostly wondering if that is a bug in OpenSSL and that should be supplied dynamically (pg_ctlctluster could check the OpenSSL version and add that option unless it's set explicly) or whether it's generally considered better to have it default to 0?