ah, it looks like tom is making some progress on ns3 here: http://code.nsnam.org/tomh/ns-3-dev-aqm
On Sat, Feb 28, 2015 at 9:58 AM, Dave Taht <[email protected]> wrote: > sfq_codel in ns2 is derived more from SFQ than DRR, and there are > several substantial differences, although sfq_codel can be almost, > but not quite, configured to act the same as the dual DRR version that > is in the actual, shipping, fq_codel. The version of DRR fq_codel uses > is more similar to "DRR+" and "DRR++", but is uniquely it's own. > > You have to use sfq_codel VERY carefully in the ns2 version, as the > ability to correctly generate a five tuple hash is not there. > Correctly generating a 5 tuple is almost, but not quite, in the ns3 > version, last I looked, and that ns3 version is MUCH closer to the > actual fq_codel version deployed in the field, but still not quite the > same thing. I have kind of lost track as to the right ns2 and ns3 > versions to start from, also. Tom? > > in terms of setting up realistic scenarios: A common (actually, nearly > universal) change to fq_codel in the field at low bandwidths (below > 50mbit) is to use a reduced quantum (300 bytes). I don't remember how > to do that right in the ns2 version. It has, after all, been 3 years > of no interest from the academic community. Also the codel target and > interval need to be tuned slightly, at below 2.5mbits to account for a > single full length packet at those speeds. > > I am delighted by the sudden upsurge in interest in the *fq_codel > versions but I would certainly appreciate more efforts on making the > underlying simulations actually match the deployment, before everyone > goes off writing papers again. > > See sch_fq_codel.c in the linux distributions since 3.6, see also > codel.h there, and compare against what you have for ns2 and ns3. > > I completely lack time or funding to make sims match the (much better > reality) at this point. Worst case, I would encourage you to test the > sims verses the deployed code with the same exact tests, so you can > see what differences exist. > > > On Sat, Feb 28, 2015 at 9:34 AM, divya singla <[email protected]> > wrote: >> can anybody tell me is there any difference between fq_Codel and Sfq_Codel? >> >> >> >> _______________________________________________ >> Codel mailing list >> [email protected] >> https://lists.bufferbloat.net/listinfo/codel >> > > > > -- > Dave Täht > Let's make wifi fast, less jittery and reliable again! > > https://plus.google.com/u/0/107942175615993706558/posts/TVX3o84jjmb -- Dave Täht Let's make wifi fast, less jittery and reliable again! https://plus.google.com/u/0/107942175615993706558/posts/TVX3o84jjmb _______________________________________________ Codel mailing list [email protected] https://lists.bufferbloat.net/listinfo/codel
