A very slow MS 4.62.2-3 & SA 3.2.1 & ClamAV 0.91 machine

[Alex Neuman van der Hans]

Julian Field wrote:
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> Alex Neuman van der Hans wrote:
>   
>> Gottschalk, David wrote:
>>     
>>> I have five mail gateways. Here are a few things I've done that 
>>> helped a lot.
>>>
>>> The item that made the biggest difference was changing 'Max Unscanned 
>>> Messages Per Scan = 30' to 10, and changing 'Max Unsafe Messages Per 
>>> Scan = 30' to 10 as well.
>>>
>>> I also increased my "Max Children" to 10, but I'm still working on 
>>> tweaking that (only been running MailScanner in production for a week 
>>> now).
>>>
>>> I had one machine that could not keep up with the volume of mail. I 
>>> couldn't figure out why one machine was having trouble when the rest 
>>> were doing fine. Soon I discovered that Spamassassin was causing a 
>>> huge slow down on that one box. It was hanging for ever on checking 
>>> if dns was avaiable or not. I set 'dns_available no' in the 
>>> spam.assassin.prefs.conf file and things sped waaayyy up. I changed 
>>> it on my other relays and it made a significant different on them as 
>>> well, but not as much as the one relay that couldn't keep up with 
>>> mail orginially. I still haven't figured out why it so greatly 
>>> effected that one machine.
>>>
>>>   
>>>       
>> I believe dns_available no might *affect* :-) machines that don't have 
>> local caching DNS enabled much more than those that don't. It's always 
>> been recommended to do this in order to minimize DNS lookup times for 
>> spamassassin.
>>     
By "do this" I mean use a caching nameserver, not disable DNS lookups... :-)
> But if you switch off DNS lookups for SpamAssassin, you will severely 
> damage its ability to detect spam. Better to diagnose your slow DNS 
> lookups and switch it back on.
>
> Jules
>
> - -- 
> Julian Field MEng CITP
> www.MailScanner.info
> Buy the MailScanner book at www.MailScanner.info/store
>
> MailScanner customisation, or any advanced system administration help?
> Contact me at Jules at Jules.FM
>
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