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

[dpreed at reed.com]

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I am likely out of date about Windows Update, but there's many other programs that do background downloads or uploads that don't implement LEDBAT or similar protection.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
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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 ]( mailto: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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