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Message-ID: <20140601080150.GE31947@example.net> Date: Sun, 1 Jun 2014 10:01:51 +0200 From: u-igbb@...ey.se To: musl@...ts.openwall.com Subject: Re: Requirements for new dns backend, factoring considerations Hello Rich, On Sun, Jun 01, 2014 at 02:31:03AM -0400, Rich Felker wrote: > process, and partly looking for feedback on some of these decisions Here you are: > As another alternative, we could drop the goal of doing search > suffixes in parallel. This would have no bearing on lookups of fully > qualified names using the default settings (ndots:1) since the > presence of a dot suppresses search. Where it would negatively impact > performance, though, is for users who want to have several search > domains (think: home network, university network, department-specific > university network, etc.) for quick shortcuts to machines on multiple > different networks. My experience is that such kind of shortcuts is dangerous and inconsistent. They stir different namespaces, this can not give a reliable outcome in a general case. What a certain shortcut resolves to depends on too many things and among others on which changes are made by third parties to the contents of the name spaces which you short-circuit (a new host in one's department can easily take the place of a desired host at a different department). So I would not care less about efficiency of an uncertain and inconsistent practice/tool :) > Another option still is leaving search domains unimplemented (musl has > not supported them up til now, and there hasn't been much request for As I see this, spending your time on other things might be a better choice. > them). But if there is, or will be, demand for them, I don't want the > resolver overhaul design to preclude doing them This is surely reasonable. > (or preclude making > them perform decently). I guess it is very few people in rare situations who might be hit by performance issues there, which would most probably also imply that they have a badly thought-out setup. So much for the feedback. Thanks for your work Rich. Rune
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