The CSV folks will insist on discussing the *worst case* for SPF, and that
looks like maybe 100X more queries than CSV, but even with all those
queries, the result is typically a few records for a sizable domain, so
caching should still be effective.
1. Concerns about SPF are held by a rather larger body of folk than just the
few of us who are developing CSV. So, compartmentalizing such criticism to
just the "CSV folks" might be comforting in the short-term but it serves only
to trivialize informed, serious feedback, rather than use it to highlight
issues that need attention.
2. The Internet is about scaling. Predicting the future is always risky and
it is particularly difficult for the Internet, since there is no way to
guarantee the behavior of future, independent entities. So Internet planning
is about scaling. To quote Paul Vixie: what happens if everyone on the
Internet uses the mechanism? What happens if the Internet is 10, or 100 or
1000 times larger?
If valid use of a mechanism can bring down an Internet infrastructure
mechanism -- even if the expectation is that is an unlikely use -- then folks
should worry a great deal about the design of the mechanism.
d/
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Dave Crocker
Brandenburg InternetWorking
+1.408.246.8253
dcrocker a t ...
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