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Re: mail delivery time on nanog-l (was Re: Die thread, DIE!)

  • From: Mikael Abrahamsson
  • Date: Fri Aug 23 01:23:42 2002

On Thu, 22 Aug 2002, Brad Knowles wrote:

> >  Here are two examples. I have seen email with 20+ minutes delay even on
> >  the last hop to me, though in the first example it was only 4-5 minutes.
> >  In the first example most of the delay is within merit, on the last one
> >  the majority of the delay is from trapdoor to my box.
> 
> 	But we don't know what the *cause* is of the delay between Merit 
> & your box.  That might be caused by network problems between the two 
> points, your box temporarily being unavailable, or whatever.

The cause is overload. There is a definate relation between amount of mail
going thru the list handling system and the delay. When there are a lot of
email being posted the delay is longer. I also notice that you ignored the
20 minute delay within the mailinglist delivery system:

Received: by trapdoor.merit.edu (Postfix)                                                           
        id 1EDD29138D; Wed, 21 Aug 2002 17:10:18 -0400 (EDT)
<cut>
Received: from segue.merit.edu (segue.merit.edu [198.108.1.41])                                     
        by trapdoor.merit.edu (Postfix) with ESMTP id 5D91191313                                    
        for <nanog@trapdoor.merit.edu>; Wed, 21 Aug 2002 16:50:00 -0400
 
> 	We just don't have enough information to make a determination as 
> to whose fault this problem is.

Well, I am convinced that the problem lies in the way the list is set up
or the software chosen. I checked approx 50 nanog-l email and almost no
email is delivered to me within 5 minutes on this list, when there are 3-5
messages being posted in quick succession the delivery time quickly goes
up to 10-15+ minutes.

All the replies to the .mil email took 10+ minutes to deliver, most of 
them 20 minutes, that's why there were so many replies because people just 
did not see each others replies. All the answers to the original post were 
done within a 30 minute window (the first one 13 minutes after the 
original post) so there are quite a few people seeing long delivery times 
here.

I am on mailing lists with many hundreds of people at other places and
normal delivery time there is sub-minute. I see no technical reason today
why an important list like nanog-l should reside on a mailing list
platform where 10+ minute delivery time is reached in 20+ % of the cases
and reached immediately when there is any load or moderate usage, and
sub-5-minute delivery is reached in less than 20% of the cases.

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se

















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