Hi Mohit, Thanks for doing the comparison! As for "/any other material related to this?/" I've had a dig around, and there is not a lot. Rasool (the FreeBSD fq-pie author) did write up a university tech report in April 2016, "/Dummynet AQM v0.2 – CoDel, FQ-CoDel, PIE and FQ-PIE for FreeBSD’s ipfw/dummynet framework/" (wayback machine link ). There's also a small mention in an LCN 2017 paper titled "/Characterising LEDBAT Performance Through Bottlenecks Using PIE, FQ-CoDel and FQ-PIE Active Queue Management/" (ieee link , author preprint ). Hope these are of some (historical) interest to your I-D (and the wider bufferbloat mailing list, too). I'm unaware of any production deployment of FreeBSD's fq-pie. cheers, gja On 2025-03-18 18:34, Mohit P. Tahiliani wrote: > Hi Grenville, > > Thanks for the email and the commit link! > > Sorry for the late reply. I was traveling, and also going through the code which you shared. > > I believe the implementation of FQ-PIE in FreeBSD matches the proposed ID very closely. I checked the code for the following: > > 1. There is a per queue PIE instance > 2. Implementation of ECN support as described in Section 5.1 of RFC 8033 (https://datatracker.ietf.org/doc/html/rfc8033#section-5.1) > 3. Use timestamps as a default approach to calculate queue delay instead of Little's Law > 4. The functionality of FQ to be similar to the one used in FQ-CoDel > > and I found that all of the above are the same as mentioned in the ID. I'll edit the ID and mention this implementation. As of now, the ID mentions two implementations: Linux and ns-3. > > Do you have any measurements performed with this implementation? or any other material related to this? I see it mentions that this is a beta implementation, but in case it was used in any real deployment or tested in live networks? > > Thanks and Regards, > Mohit P. Tahiliani > > On Tue, Mar 11, 2025 at 6:51 AM grenville armitage via Bloat wrote: > > Hi Mohit, > > I wonder what you think of the fq-pie developed for FreeBSD back in 2015 and merged in May 2016? (commit here .)  It has been too long since I last looked, so would love your thoughts on how it aligns (or doesn't) with https://datatracker.ietf.org/doc/draft-tahiliani-tsvwg-fq-pie/? > > cheers, > gja > > On 2025-03-11 06:01, Mohit P. Tahiliani via Bloat wrote: >> Hi all, >> >> I have been working on an Internet Draft on Flow Queue PIE (FQ-PIE) [https://datatracker.ietf.org/doc/draft-tahiliani-tsvwg-fq-pie/], and recently submitted a revised version. >> >> It has been incorporated into the mainline Linux kernel as a queuing discipline (qdisc). Additionally, an implementation of FQ-PIE is available in the ns-3 network simulator. >> >> If you have any suggestions or feedback, please let me know. >> >> Thanks and Regards, >> Mohit P. Tahiliani >> >> ---------- Forwarded message --------- >> From: >> Date: Tue, Mar 4, 2025 at 12:56 AM >> Subject: New Version Notification for draft-tahiliani-tsvwg-fq-pie-01.txt >> To: Mohit P. Tahiliani >> >> >> A new version of Internet-Draft draft-tahiliani-tsvwg-fq-pie-01.txt has been >> successfully submitted by Mohit Tahiliani and posted to the >> IETF repository. >> >> Name:     draft-tahiliani-tsvwg-fq-pie >> Revision: 01 >> Title:    Flow Queue PIE: A Hybrid Packet Scheduler and Active Queue Management Algorithm >> Date:     2025-03-03 >> Group:    Individual Submission >> Pages:    8 >> URL: https://www.ietf.org/archive/id/draft-tahiliani-tsvwg-fq-pie-01.txt >> Status: https://datatracker.ietf.org/doc/draft-tahiliani-tsvwg-fq-pie/ >> HTML: https://www.ietf.org/archive/id/draft-tahiliani-tsvwg-fq-pie-01.html >> HTMLized: https://datatracker.ietf.org/doc/html/draft-tahiliani-tsvwg-fq-pie >> Diff: https://author-tools.ietf.org/iddiff?url2=draft-tahiliani-tsvwg-fq-pie-01 >> >> Abstract: >> >>    This document presents Flow Queue Proportional Integral controller >>    Enhanced (FQ-PIE), a hybrid packet scheduler and Active Queue >>    Management (AQM) algorithm to isolate flows and tackle the problem of >>    bufferbloat.  FQ-PIE uses hashing to classify incoming packets into >>    different queues and provide flow isolation. Packets are dequeued by >>    using a variant of the round robin scheduler.  Each such flow is >>    managed by the PIE algorithm to maintain high link utilization while >>    controlling the queue delay to a target value. >> >> >> >> The IETF Secretariat >> >> >> >> _______________________________________________ >> Bloat mailing list >> Bloat@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/bloat > > _______________________________________________ > Bloat mailing list > Bloat@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/bloat >