[Bloat] tc -s qdisc questions

[Dave Taht]

On Fri, May 15, 2015 at 1:55 AM, Mikael Abrahamsson <swmike at swm.pp.se> wrote:
> On Fri, 15 May 2015, Kevin Darbyshire-Bryant wrote:
>
>> Ahh!  Penny drops, light goes on.  Thanks Jonathan & Dave.  I thought it
>> was some magic the router performed but now I can see how silly my thinking
>> is on that.  So presumably it would be helpful to enable ecn on the openwrt
>> router box IF that box were producing significant traffic of its own, in
>> addition to all the LAN side boxes?
>
>
> Correct. If it for instance was running a http proxy server (and thus
> terminating TCP sessions), turning on ECN on the box itself would make
> sense.

This was (prior to crypto on everything http starting to be mandated) a
very good idea for satellite links - run everything through a proxy, make
the proxy and proxy box be smarter about tcp/ecn - and set the fq_codel
implementation more appropriately for the rtt.

Web proxies are still quite  heavily used in education and some corporate
markets. In fact the first ever commercially deployed fq_codel implementation
(in NZ) was on a web proxy/firewall box.

I do wish more high end firewall makers were paying attention to the
bufferbloat work. They are usually the first line of defense and sole
hop before hitting the (cable,dsl,fiber)modem and thus are perfect
targets for deploying aqm/fq technologies.

Certainly the pfsense
folk are getting it but no sign of life at barracuda and checkpoint
that I know of.


> --
> Mikael Abrahamsson    email: swmike at swm.pp.se



-- 
Dave Täht
Open Networking needs **Open Source Hardware**

https://plus.google.com/u/0/+EricRaymond/posts/JqxCe2pFr67