[126158] in North American Network Operators' Group
Re: Emulating ADSL bandwidth shaping
daemon@ATHENA.MIT.EDU (Raymond Dijkxhoorn)
Tue May 4 04:55:25 2010
Date: Tue, 4 May 2010 10:54:39 +0200 (CEST)
From: Raymond Dijkxhoorn <raymond@prolocation.net>
To: Patrick Giagnocavo <patrick@zill.net>
In-Reply-To: <4BDF922B.5080408@zill.net>
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Hi!
>> - do ISPs typically use token bucket filters with large bursts to shape traffic?
>> - what kind of burst sizes and latencies/limits are typically used for
>> the filter?
> You will definitely have to account for latency.
>
> For emulating cable traffic, latencies (in the USA) will be about
> 60-80ms to typical sites. Burst mode in my experience occurs only for
> about the first 15 seconds, then is throttled back (though not always;
> seems to depend on time of day).
>
> For DSL, I seem to recall latency being about 90-110ms (note, I haven't
> used DSL in many years). Burst mode was generally not noticeable or
> available, that is, you got the same speed regardless of downloading a
> 1MB jpeg or a 640MB .iso file.
The latency i have here on my DSL is ~ 16-22 ms. So its much lower, factor
4...
Bye,
Raymond.
