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.
Simon
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On May 18, 2015 8:09:39 AM [email protected] 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" <[email protected]> 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I am likely out of date about Windows Update, but there's many other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" <[email protected]> wrote:On
2015-5-18, at 07:06, Simon Barber <[ [email protected] ](
mailto:[email protected] )> 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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