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From: Jesper Dangaard Brouer <jdb@comx.dk>
To: Pedro Tumusok <pedro.tumusok@gmail.com>
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Organization: ComX Networks A/S
Date: Wed, 11 May 2011 14:42:41 -0400
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Cc: bloat <bloat@lists.bufferbloat.net>
Subject: Re: [Bloat] Bismark router + ecn + red tested
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On Wed, 2011-05-11 at 10:49 +0200, Pedro Tumusok wrote:

> I got a Linux based router, ZyXEL P2612 (ADSL2+) and also the P2812
> (VDSL2) both got an ethernet wan port also.
> I can mess around with qdisc on it, since the web ui QoS setup just
> creates qdisc settings to correspond.

Please remember to take the ADSL overhead into account, when configuring
HTB, or else we/you don't have control over the queue, which is the
hole-point when trying to solve bufferbloat by AQM/shaping.

Simply add parameters when creating qdisc:
  linklayer adsl
and
  overhead XXX

BTW, I don't think its needed, when using VDSL2, as I think its
linklayer is not ATM.


> [...] cut [...]
> Its got an old kernel, with lots of patches to kernel I think, so not
> sure if its easily done to create a new kernel for it either.
> 
> # uname -an
> Linux P-2612HNU-F3 2.6.20.19 #44 Wed Mar 30 10:58:43 CST 2011 mips unknown

Damm, linklayer overhead got introduced in 2.6.24.


-- 
Best regards,
  Jesper Dangaard Brouer
  ComX Networks A/S
  Linux Network Kernel Developer
  Cand. Scient Datalog / MSc.CS
  Author of http://adsl-optimizer.dk
  LinkedIn: http://www.linkedin.com/in/brouer