DNS Update (Thread?)

[Ted Lemon]

> I'm trying to look at what kind of delays our servers are 
> experiencing, and
> how we can improve performance. One of my areas of inquiry has been 
> into
> the DNS Update code; my understanding is that updates block the server
> while waiting for a response/timeout.

That's right.

> So, the first questions is whether this is correct. Secondly, assuming 
> it
> is, does it make sense to try and develop some update code that uses 
> the
> server's existing timeout model to not completely block when doing the
> updates?

Yes.   You can do something like what the current ping timeout code 
does.   The trick is that you will have to hack minires to pieces to 
get it to do this correctly - right now, sending and receiving are done 
in the same function, rather than as callbacks.