AD DC LDAP server multi-process - slower!

[Andrew Bartlett]

G'Day,

We had a simple patch to change the single process LDAP server into
multi-process, in the standard model like smbd uses, one fork per
connection. 

The performance on a test of 
 - connect
 - NTLM binds
 - drop socket
showed using multiple processes this way, with the high exit cost, is
actually slower.  We expected that having mutiple CPUs available would
make it at least a little faster, and we would optimise from there with
the talloc_for_exit() or similar.

We will re-investigate the prefork process model for the ldap server. 

Andrew Bartlett