Justin Mason wrote: > I have a theory that this would indeed cause major slowdowns, since > every warning message has to be transmitted via UDP to the syslogd > daemon, who then writes it synchronously to disk. That is a pretty > slow operation, and causes I/O.
Just a guess: if strings being processed (mail contents or rules or whatever) happen to get their utf8 flag set, Perl string operations become significantly slower - as documented. I haven't noticed performance degradation with SA under amavisd-new (perhaps I wasn't paying attention, or it pays off that we are careful never to let bytes become Perl characters unexpectedly), but it would be worth checking at a couple of places within SA is strings suddenly became utf8-flagged, which may happen as a result of some concatenations or other string operations, or I/O from UTF8 file handles. To test a string for utf8 flag, use function: Encode::is_utf8($string). An observation that 'use bytes' speeds things up, seems to confirm my suspicions. Mark
