[Bloat] pie aqm finally landed in Linux

Aaron Wood woody77 at gmail.com
Mon Jan 20 13:56:38 EST 2014

I'm definitely interested in seeing if the new pie implementation fares
better than what I was seeing on 3.10.24-8.


On Mon, Jan 20, 2014 at 4:46 PM, Dave Taht <dave.taht at gmail.com> wrote:

> http://www.spinics.net/lists/netdev/msg264935.html
> Hat off to vijay and the pie folk at cisco who shepherded the code
> through 5 releases to get it upstream!
> PIE is now mandated in DOCSIS3.1 cablemodems and the ECO for DOCSIS
> 3.0 went out a while ago.
> I think the mandate differs from the Linux implementation. I don't
> know the size of the recomended cablelabs target nor the size of the
> estimation window (?)).
> So that will improve going-upstream buffering problems dramatically.
> The linux implementation supports ECN, the DOCSIS standard does not.
> The ECN work in pie has some minor problems that fq_codel doesn't
> have, we hope to discuss at ietf...
> I will fold the v5 implementation of pie into cerowrt in the next release
> and
> see what happens.
> NOW:
> The biggest problem remaining in cable is fixing excessive downstream
> buffering. Surely something can be done to remove the 1.6 seconds of
> buffering I observed yesterday (at some level without needing to AQM?
> Some workaround that operators can use?). Some benchmarks I ran last
> night (not against pie):
> http://snapon.lab.bufferbloat.net/~d/bev/comcast_native_ipv6/
> I sure hope the gpon, lte, and wifi folk are paying attention.
> --
> Dave Täht
> Fixing bufferbloat with cerowrt:
> http://www.teklibre.com/cerowrt/subscribe.html
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