Autor: Mark Lowes Datum: To: exim-users CC: Nigel Metheringham Betreff: Re: [exim] High Perf server - was (exim allowed someone to slam my
mailserver for 3 hours)
Nigel Metheringham wrote: > On Wed, 2005-06-29 at 14:25 +0200, Daniel Tiefnig wrote:
>>Shouldn't this make no difference on any reasonable Operating System?
>>The hints DB should always be in RAM anyways, so I don't see how it
>>should speed up significantly by placing them on a ramdisk.
>>Does exim do sync() on its hint DBs?
> The underlying database engine (db/dbm/gdbm) would almost certainly sync
> the files to ensure other processes are getting consistent data.
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.
