Wietse Venema put forth on 12/1/2009 3:47 PM: > Surely, mail is injected via SMTP, and therefore, the Postfix SMTP > server will attempt to lookup the client hostname and IP address; > since they are using SMTP-based content filters, that is another > source of name service lookups. All this presents a load on name > service. I have seen enough to know that a bad DNS configuration > can do wonders for performance.
Assuming the test streams are generated by a handful of SPECmail load generator hosts, the hostnames and addresses of those client machines would quickly be cached, no? That doesn't generate a real world SMTP DNS scenario, does it? The handful of names and IPs would only be a minute fraction of the real world client variety, and I would assume DNS delays would be minimal in this test environment. I guess it's always possible that the local resolvers he's testing with could have a problem, if that's what you mean. -- Stan
