[175731] in North American Network Operators' Group
Re: Industry standard bandwidth guarantee?
daemon@ATHENA.MIT.EDU (Sander Steffann)
Thu Oct 30 15:43:16 2014
X-Original-To: nanog@nanog.org
From: Sander Steffann <sander@steffann.nl>
In-Reply-To: <CAAAwwbVBjK5vE-X5f_WTiCiHz4GOEOP1oi+4PYVYvuJBiPjYiQ@mail.gmail.com>
Date: Thu, 30 Oct 2014 20:11:53 +0100
To: Jimmy Hess <mysidia@gmail.com>
Cc: keith tokash <ktokash@hotmail.com>, "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
Hi,
> and this industry would
> perhaps be better off if we called a link that can deliver at best 17
> Megabits of Goodput reliably a "15 Megabit goodput +5 service"
> instead of calling it a "20 Megabit service"
But you don't know what the user is going to do over the link. If the =
average packet size is very small the overhead will be much larger. And =
the path-MTU depends on many factors besides the customer link. The only =
real number to give to the customer is the raw link speed. Everything =
else depends on how the link is used. Giving customer numbers like "IF =
you do X then expect a maximum speed of Y" will only cause more =
confusion. Especially because you can only give theoretical maximums =
because real speeds depend on many other factors (pMTU, RTT, congestion =
somewhere etc) as well.
Cheers,
Sander
