[WWI] Not complaining....but

NEIL EDDY se5a at iprimus.com.au
Wed Aug 18 17:52:05 EDT 2004


Also depends on how fast the monkey is pedalling.......

Neil E

----- Original Message ----- 
From: "Shane Weier" <bristolf2b at hotmail.com>
To: <wwi at wwi-models.org>
Sent: Thursday, August 19, 2004 6:39 AM
Subject: RE: [WWI] Not complaining....but


> Neil says
>
>
> >Don is correct, even for us who are in mail mode (not digest),
> >mails often arrive in the wrong order. It's pixie magic.
> >
>
> Back when I had a day job, I was responsible for email performance for my
> global employers, so I have a reasonable understanding of what's
happening.
> Simplified slightly because I don't want to be more than usually boring
this
> is what happens...
>
> When you send an email, it goes from your PC to a mail server at your
> service provider (ISP). To get to the destination it has to be passed
> through a chain of mailservers, some (maybe) belonging to the same ISP,
> mostly not. It's designed to be pretty bombproof, so if the data
> communications between any of the servers is down for some reason the
email
> will be held and the server keeps trying until it gets through.
>
> But...if the line is down for a while one of several mechanisms can cause
> your email to arrive out of order.
>
> If it's stored as it arrives (like stacking plates) and then sent by
taking
> the last arrived email and sending it on, then the next to last (like
> unstacking plates) all the emails that were held will be sent in reverse
> order.
>
> Or, the delayed mail can be reroutedby a slower path. If the original fast
> link comes back up again the next (later) emails will go the fast route
and
> get to you first.
>
> or, even when things are working properly, where there are multiple paths,
> some emails will go the fast way, others will go the slow way and arrive
out
> of order.
>
> But the should all arrive, and usually do, to an order of reliability
which
> in the context of the billions of emails flowing around is amazing even to
> someone who spent his life working on data comms
>
> Shane
>
> .---- - --- ....- ---.. .-. ..- .-.. . ... .-.-.-
>
> My Strine is a Toad in Disguise
>
> .---- - --- ....- ---.. .-. ..- .-.. . ... .-.-.-
>
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