Re: [exim] High Perf server - was (exim allowed someone to s…

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Autor: Tony Finch
Datum:  
To: Mark Lowes
CC: exim-users
Betreff: Re: [exim] High Perf server - was (exim allowed someone to slam my mailserver for 3 hours)
On Wed, 29 Jun 2005, Mark Lowes wrote:
>
> The actual error I was encountering was a "timeout getting lock",
> causing slowdown on handling incoming connections before it gave up
> trying to work out the rate limiting stuff. It's possible that my
> ratelimiting rules are a little aggressive which isn't helping the
> situation but as traffic ramps up the problem would have been reached
> anyway.


You are using a *lot* of ratelimit rules, which implies thrashing the
ratelimit hints db lock. Although the code caches the results of ratelimit
calculations where appropriate, you can defeat this by using per_rcpt
limits etc. Perhaps I should add a caveat to the documentation.

Tony.
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