[50022] in North American Network Operators' Group
RE: fractional gigabit ethernet links?
daemon@ATHENA.MIT.EDU (Phil Rosenthal)
Mon Jul 15 23:33:11 2002
Reply-To: <pr@isprime.com>
From: "Phil Rosenthal" <pr@isprime.com>
To: <nanog@merit.edu>
Date: Mon, 15 Jul 2002 23:31:41 -0400
In-Reply-To: <Pine.WNT.4.43.0207152305190.3112-100000@NEON.hq.nac.net>
Errors-To: owner-nanog-outgoing@merit.edu
This may sound a bit ridiculous, but say the timer is every 0.25ms.
100kbit per 0.25ms = 400,000kbit or 400 mbit.
It is remotely possible to hit a 300 mbit limit with only 100kbits of
traffic, if the timer is sufficiently short, and your traffic is
sufficiently bursty.
Unless your traffic is Mcast, I doubt that issue is related.
Can you ask your provider how exactly they are limiting the pipe? When
dealing with 300 or so megs, I doubt they will be shaping with a policy
friendly to you, as the logistics of doing so are a bit difficult.
--Phil
-----Original Message-----
From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of
Alex Rubenstein
Sent: Monday, July 15, 2002 11:06 PM
To: Phil Rosenthal
Cc: nanog@merit.edu
Subject: RE: fractional gigabit ethernet links?
On Mon, 15 Jul 2002, Phil Rosenthal wrote:
>
> Hello Alex,
>
> I'd say this sounds obvious, but may be deceptively so...
> If you are taking a pipe capable of 1000 mbit, and rate-limiting it to
> 311 mbit, the logic used may be:
>
> In the last 1000 msec have there been more than 311mbits? If yes:
> drop.
Except, we're at the levels of 100 kbit/second in our tests.
I did just find CSCdr94172, which might be related.
-- Alex Rubenstein, AR97, K2AHR, alex@nac.net, latency, Al Reuben --
-- Net Access Corporation, 800-NET-ME-36, http://www.nac.net --
