[Mailman-Users] Mailman 2.1.6 slowness...?

Jeff Squyres jsquyres at osl.iu.edu
Sat Jul 16 14:15:33 CEST 2005

Our load averages are definitely quite small -- hovering below 1.0.   
Our sendmail configuration hasn't changed since we upgraded to 2.1.6,  
which is why we're [initially] thinking that it isn't a sendmail issue.  
  Our disks are also quite far from full -- we have oodles of disk  

Clarifying question, however -- will mailman only make one SMTP  
connection at a time (and block all further outgoing processing until  
that one SMTP connection is complete)?  Is this why you're suggesting  
proper tuning of SMTP_MAX_RCPTS?

We didn't change the value of SMTP_MAX_RCPTS between 2.1.5 and 2.1.6  
(500).  Perhaps this is too high (none of our lists have close to 500  
subscribers in a single domain).  We routinely see large sendmail  
outgoing queues (and did with 2.1.5, too).

A comment in one of the prior e-mails made me go check the other qfiles  
directories -- we have a few hundred files in the qfiles/bad directory  
(~200) and a few thousand in qfiles/shunt (~4000).  What are these  
files? (pardon the newbie question)

Thanks for all your suggestions -- we're checking them in the  
background, but it takes a little time to check properly.  Also, based  
on your replies, I think we need to triple check with our sendmail  
maintainers and ensure that they really, really didn't change anything  
between when we were running 2.1.5 and 2.1.6 (they swear that they  
didn't, but we'll ask again).

On Jul 15, 2005, at 6:57 PM, Brad Knowles wrote:

> At 2:55 PM -0700 2005-07-15, Carl Zwanzig wrote:
>>  Sendmail used to throttle itself based on load average of the host.
>>  With new mailman code, and possible newer python (was python  
>> replaced?),
>>  you could be hitting one of those thresholds. It was somewhere in the
>>  sendmail.cf file.
> 	Hmm.  Actually, I think you may be on the right track, but not
> with regards to load average.  The more recent versions of sendmail
> will also allow only so many simultaneous connections open, and that
> can also be a bottleneck.  Proper tuning of SMTP_MAX_RCPTS is
> definitely something you want to look at -- too large can hurt you,
> as can too small.
> --  
> Brad Knowles, <brad at stop.mail-abuse.org>
> "Those who would give up essential Liberty, to purchase a little
> temporary Safety, deserve neither Liberty nor Safety."
>      -- Benjamin Franklin (1706-1790), reply of the Pennsylvania
>      Assembly to the Governor, November 11, 1755
>    SAGE member since 1995.  See <http://www.sage.org/> for more info.
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{+} Jeff Squyres
{+} jsquyres at osl.iu.edu
{+} Post Doctoral Research Associate, Open Systems Lab, Indiana  
{+} http://www.osl.iu.edu/

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