[Bloat] AQM creeping into L2 equipment

[Dave Taht]

On Tue, Mar 18, 2014 at 2:05 PM, Fred Baker (fred) <fred at cisco.com> wrote:
>
> On Mar 18, 2014, at 10:17 AM, Dave Taht <dave.taht at gmail.com> wrote:
>
>>> I thought some of you might be interested in a small observation I made
>>> today: Cisco 2960-X, their latest low-end (?) L2 access switch offering
>>> (well, it can do some L3 as well, especially the 2960-XR, but I don't think
>>> it's very commonly used), has WRED on its feature list. They also have
>>
>> I would certainly like good documentation on how to configure it and
>> results with/without on a two ports into one test.
>
> Thus saith google: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960x/software/15-0_2_EX/qos/configuration_guide/b_qos_152ex_2960-x_cg/b_qos_152ex_2960-x_cg_chapter_010.html


The standard test that I'm most interested in is the 2 ports into 1 topology:

SOURCE
      |
SWITCH
 |            |
BOX1   BOX2

and finding "optimal" settings for that.

All links are gigE for this... each box runs a copy of the rrul test
(attempting to saturate up/down and measure loss/delay on several
differently classified measurement flows), with various switch
configurations (wred, srr, wtd, whatever)

can add in a delay box.

Donations/loans of various cool switches gladly accepted. :)

A topology with a 10Gige source is also interesting. There have been
so many improvements to linux tcp that it's hard to intuit behaviors
since when we started the debloating effort.

-- 
Dave Täht

Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html