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Re: New performance results
Andreas Hasenack wrote:
Em SÃb, 2007-11-03 Ãs 03:30 -0700, Howard Chu escreveu:
(The AD numbers aren't all in yet, we're still waiting for the directory
import to finish.)
In the authentication and other online tests, were the ACLs on all
servers the same? Or no ACLs whatsoever? I suppose this would have an
impact on performance.
It's not really possible to make the ACLs identical, since the servers' access
control systems are very different. Nor is it meaningful to turn off all of
the ACLs. As such, a minimal set of rules are used on each server, but that
set is necessarily different in each implementation. I believe this is still
fair, since the security implementation is an integral part of each server.
E.g., all the servers use TCP/IP, but their TCP/IP implementations are also
different. That's just one of many intrinsic elements that defines the
properties of a given server.
For AD and ADAM we used their default security settings. Since by default they
don't allow anonymous operations, we created a "cn=bench" user for
authenticating each session. Also in AD and ADAM a user needed to belong to a
particular group in order to have read access to the rest of the DIT. So we
also created a "cn=readers" group in OpenLDAP with our bench user as a member
and set the corresponding ACLs.
Likewise, I have no idea what the default mechanism for validating a plaintext
Simple Bind password is in AD/ADAM. We tested OpenLDAP with both plaintext and
SSHA hashes. Computing an SHA hash is certainly more CPU intensive than just
doing a simple memcmp on a plaintext password, but is it equivalent to AD's
hash? Who knows? AD isn't documented well enough for anyone to say. But
ultimately it doesn't matter, because you cannot change AD's configuration and
choose a different mechanism. So in terms of comparing overall server
behavior, sure there will be differences, but those are intrinsic to each
server implementation. Those intrinsic differences are indeed the entire
reason why comparative testing needs to be done in the first place...
-- Howard Chu
Chief Architect, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/