Re: Performance degradation in 4.0.2?

[email protected] Wed, 3 Sep 2025 09:56:22 +0200

Newsgroups	gmane.mail.spam.spamassassin.general
Message-ID	<[email protected]>

On 9/3/25 9:04 AM, Tobi wrote:
> Hello list
> 
> since beginning of this week we use the new spamassassin 4.0.2 Since
> then we can see that processing time (at least for particular mails)
> massively increased. We use a timeout of 30s in our setup to
> communicate with SA.
> 
> Two mails we now have that cannot be processed anymore in that time and
> therefore get stuck in our processing.
> 
> Mail A has a huge load of links/mailtos in header and body. About 7k.
> The timing in processing with the very same rules is from 6s (in 4.0.1)
> to 2.5min (in 4.0.2). I counted the number of URI spamassassin detected
> and the number of DNS queries in both versions and they are more or
> less equal. So I guess the increase in processing time is not DNS
> related.
> 
> Mail B does not have that many URI but a quite complex HTML attachment
> with a load of styles with almost every div and span tag. The
> processing time is 4s (in 4.0.1) and about 1min (in 4.0.2).
> 
> I will check in our timings logs to see if we see a general increase in
> timings or if it's more only related to specific mails.
> 
> Have a good one
> 
Hi,
one commit that can degrade performance is this commit https://github.com/apache/spamassassin/commit/4a6643c72fe5cd6296b2e67eb0ccc368a4987caa
This tries to find CNAMEs for all hosts found in the email.
 From my tests this can slow down email processing a bit but not that much.
Could you send me those emails in private ?
  Thanks
   Giovanni

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