Zitat von Victor Duchovni <victor.ducho...@morganstanley.com>:
On Mon, Nov 15, 2010 at 10:00:42PM +0100, lst_ho...@kwsoft.de wrote:Conditionally compiling-in support for such a library is a bit painful, though opendkim seems to have taken that approach. They have a DNS lookup driver layer, and the driver reports whether it can support overlapping queries... You can then choose to use an async DNS library if you have one.Thanks for explaining the details. I don't really have the traffic to care about this "limitation", it was more of to learn about implications on deploying IPv6 in a network with different services running and to get knowledge where problems might arise.Note that async libraries will rarely help with MX host resolution. In almost all problem situations, one of the record types will dominate the lookup time and Postfix will have to wait for both to complete, and parallelizing does not speed up the slow path.
Ah, yes. At a first glace i thought first-win could be used, but this would lead to inconsistent behavior dependant on lookup speed. So the only performance advantage would be that the lookup times are not added which is limited to factor 2 (ipv6,ipv4) in this case anyway.
Thanks Andreas
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