[Cerowrt-devel] [Cake] [Bloat] heisenbug: dslreports 16 flow test vs cablemodems

Dave Taht dave.taht at gmail.com
Mon May 18 13:21:29 EDT 2015

On Mon, May 18, 2015 at 8:32 AM, Simon Barber <simon at superduper.net> wrote:
> LEDBAT is often used for scavenger traffic - things that should not detract
> from normal Internet use. There are two effects, latency and bandwidth.
> While AQM solves the latency problem, it removes the ability of LEDBAT to
> not impact bandwidth during peak usage.

data transport over neutrinos would help!

seriously, iw10 and cubic knock utp out of the way to a larger extent
that is a start.

I would like it if we saw more work in the area of making ledbat
lighter in the light of deployment of fq and aqm technologies.

> Simon
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> http://www.aqua-mail.com
> On May 18, 2015 8:09:39 AM dpreed at reed.com wrote:
>> I'm curious as to why one would need low priority class if you were using
>> fq_codel?  Are the LEDBAT flows indistinguishable?  Is there no congestion
>> signalling (no drops, no ECN)? The main reason I ask is that end-to-end
>> flows should share capacity well enough without magical and rarely
>> implemented things like diffserv and intserv.
>> On Monday, May 18, 2015 8:30am, "Simon Barber" <simon at superduper.net>
>> said:
>> I am likely out of date about Windows Update, but there's many other
>> programs that do background downloads or uploads that don't implement LEDBAT
>> or similar protection. The current AQM recommendation draft in the IETF will
>> make things worse, by not drawing attention to the fact that implementing
>> AQM without implementing a low priority traffic class (such as DSCP 8 - CS1)
>> will prevent solutions like LEDBAT from working, or there being any
>> alternative. Would appreciate support on the AQM list in the importance of
>> this.
>> Simon
>> Sent with AquaMail for Android
>> http://www.aqua-mail.com
>> On May 18, 2015 4:42:43 AM "Eggert, Lars" <lars at netapp.com> wrote:
>>> On 2015-5-18, at 07:06, Simon Barber <simon at superduper.net> wrote:
>>> Windows update will kill your Skype call.
>>> Really? AFAIK Windows Update has been using a LEDBAT-like scavenger-type
>>> congestion control algorithm for years now.
>>> Lars
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Dave Täht
Open Networking needs **Open Source Hardware**


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