Debug on a production server

Julian Field MailScanner at ecs.soton.ac.uk
Fri Oct 12 09:21:43 IST 2007


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Scott Silva wrote:
> on 10/11/2007 1:38 PM Mikael Syska spake the following:
>> Scott Silva wrote:
>>> on 10/11/2007 12:02 PM Mikael Syska spake the following:
>>>> Ugo Bellavance wrote:
>>>>> Mikael Syska wrote:
>>>>>> Hi,
>>>>>>>> There does not seem to be much info on this ... and my scan 
>>>>>>>> times are also rather high ... not that its a problem atm ... 
>>>>>>>> but it could be in the future :-(
>>>>>>>
>>>>>>> Please provide more information:
>>>>>>>
>>>>>>> Hardware
>>>>>> OS: FreeBSD 7 ( yes its current, but 6.4 did not perform very 
>>>>>> disk with the SAS 5iR controller
>>>>>> 2GB ram
>>>>>> Dual Core Intel Xeon 3060 2.40 Ghz
>>>>>>> # of child processes
>>>>>> 8
>>>>>>> scan times of full batches.
>>>>>> Oct 11 18:48:58 spam02 MailScanner[72858]: Batch (15 messages) 
>>>>>> processed in 89.57 seconds
>>>>>> Oct 11 18:49:08 spam02 MailScanner[72872]: Batch (15 messages) 
>>>>>> processed in 88.72 seconds
>>>>>> Oct 11 18:49:10 spam02 MailScanner[72854]: Batch (15 messages) 
>>>>>> processed in 106.89 seconds
>>>>>> Oct 11 18:49:19 spam02 MailScanner[72865]: Batch (15 messages) 
>>>>>> processed in 105.85 seconds
>>>>>
>>>>> Looks fine.  Is there a reason why you use 15 message batches?
>>>> you mean instead of 30 ....
>>>>
>>>> Some performance turning I read on the wiki ... but t does not seem 
>>>> to have any effect on my system ... so it will do up to deafult again.
>>>>>
>>>>>>> Using RBLs at MTA
>>>>>> nope ... we have had very bad exprerience with that ... both 
>>>>>> tried spamcop and spamhaus ... both have to many FP here in 
>>>>>> denmark ....
>>>>>
>>>>> Spamcop is FP-prone, but I've never heard of a FP in north america 
>>>>> for spamhaus.
>>>> Then you are a lucky man ...
>>>>
>>>> since the server aint that overloaded I dont see any reason to risk 
>>>> getting any FP ...
>>>>>
>>>>>> Its not a problem that I takes so long time .. just saw the 
>>>>>> message about the patch and wandered if that would make a diff on 
>>>>>> my scan times ...
>>>>>
>>>>> Ok, I doubt so. Did you put the MailScanner working dir and /tmp 
>>>>> in memory (tmpfs on linux)?
>>>> no ... its on the disk ... and since every mail could be far too 
>>>> important I dont intend to use it ....
>>> Tmpfs is absolutely safe on mailscanner if you follow the wiki and 
>>> only put the mailscanner incoming directory there. And the speed 
>>> increase is very noticeable, especially in virus and spam scanning.
>>> Mailscanner does not actually remove any messages. It sees the 
>>> message in mqueue.in, extracts it to incoming, does its work, and if 
>>> messages are clean it hard links it to mqueue and then unlinks from 
>>> mqueue.in. So there is no chance of mailscanner losing a message. If 
>>> it dies at any point up to the unlink, the original message is in 
>>> mqueue.in waiting to be processed again.
>> You mention the wiki ... I can only see 
>> http://wiki.mailscanner.info/doku.php and a link to: 
>> http://www.sng.ecs.soton.ac.uk/mailscanner/serve/cache/120.html witch 
>> does not seem to work.
>>
>> and there does not seem to be anything about tmpfs ... if ... then 
>> I'm not able to find it ...
>>
> Julian,
> Do you have any of this old material ( like 
> http://www.sng.ecs.soton.ac.uk/mailscanner/serve/cache/120.html) 
> archived somewhere?
> I would be willing to spend some time fixing this up if I had the 
> content to put in.
> I don't want to go from memory, as I will probably get something 
> really wonky.
>
Thank you very much, it's greatly appreciated!
The old material is now online again at
http://www.sng.ecs.soton.ac.uk/mailscanner.archive/serve/cache/
If you could get it added to the wiki (the useful bits, anyway :-) that 
would be great.

Cheers,

Jules

- -- 
Julian Field MEng CITP
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