"I/O error on connection" problem. MailScanner related?

[Julian Field]

On 19 Jul 2006, at 20:11, Chris W. Parker wrote:

> Julian Field <mailto:MailScanner at ecs.soton.ac.uk>
>     on Wednesday, July 19, 2006 11:42 AM said:
>
>> The "uptime" load averages (also printed by "top") are a vague
>> indication of system load, but don't worry if these are much greater
>> than 1. If they are less than 1 then your system definitely isn't
>> loaded. Check your sendmail settings in /etc/mail/sendmail.cf. Look
>> for QueueLA and other load averages limits (which all contain LA in
>> their name). It's usually worth increasing them as MailScanner can
>> push the load average up to 15 quite easily when fully loaded and
>> working nicely. So don't start refusing messages until the load
>> average is really quite high.
>
> Thanks Julian. I'm going to experiment with this for a few days and  
> see
> what happens. As an extreme test I set both QueueLA and RefuseLA to 0.
>
>> The virus scanners should only use CPU very briefly, they usually
>> aren't significant at all in the load of MailScanner. Try switching
>> off the biggies such as SpamAssassin and see how it speeds up.
>
> As I don't want to lose spam detection or virus detection I also tried
> changing the Queue Scan Interval from 10 seconds to 30. I don't recall
> what the default value was (perhaps 10?) but I imagine that at some
> point it's more efficient to check the queue often rather than let the
> queue build up quite large and check it only periodically. Is there  
> any
> rule of thumb to this or does it vary too greatly from system to  
> system?

Remember you have several child processes, all of which will be  
checking the queue once every 10 seconds. You could quite happily  
increase this number without causing any problems. Feel free to tweak  
it up a bit.

-- 
Julian Field
MailScanner at ecs.soton.ac.uk



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