Simon Byrnand <[EMAIL PROTECTED]> writes:
> So umm, how does the rbl_timeout setting work in 2.60 then ? I didn't quite
> follow the logic of what you said :) I would have previously assumed that
> it was just a cutoff where if an individual test took longer than that it
> was aborted.... but it doesn't sound like it works like that at all...
It is still a cut-off, but it will cut-off earlier if most of the
queries have already been made successfully. It works well in practice
because the timeout is relative to the overall responsiveness of the
network and blacklists.
The benefits:
- if one or a few blacklists are down, they timeout quickly enough that
you probably don't need to disable them for short outages
- it's done without all the overhead and complication of tracking the
status of each blacklist
- when a blacklist comes back up, it is used immediately
> I have rbl_timeout set to 10 in 2.55 so if I should be setting it higher
> when I upgrade to 2.60 I'd like to have some vaugue understanding of why :)
The documentation is hopefully clearer than my email:
rbl_timeout n (default 15)
All RBL queries are made at the beginning of a check and we try to
read the results at the end. This value specifies the maximum period
of time to wait for an RBL query. If most of the RBL queries have
succeeded for a particular message, then SpamAssassin will not wait
for the full period to avoid wasting time on unresponsive server(s).
For the default 15 second timeout, here is a chart of queries
remaining versus the effective timeout in seconds:
queries left 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0%
timeout 15 15 14 14 13 11 10 8 5 3 0
In addition, whenever the effective timeout is lowered due to
additional query results returning, the remaining queries are always
given at least one more second before timing out, but the wait time
will never exceed the timeout.
For example, if 20 queries are made at the beginning of a message
check and 16 queries have returned (leaving 20%), the remaining 4
queries must finish within 5 seconds of the beginning of the check
or they will be timed out.
(yeah, I just reworded it a tiny bit from 2.60-rc3)
Daniel
--
Daniel Quinlan anti-spam (SpamAssassin), Linux, and open
http://www.pathname.com/~quinlan/ source consulting (looking for new work)
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