Hi Grenville,

Thanks for the email.

I have replied inline below:

On Sun, Mar 23, 2025 at 2:28 AM grenville armitage <gja.ietf@gmail.com> wrote:

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).

Thanks for sharing these links. I will go through the material.

I'm unaware of any production deployment of FreeBSD's fq-pie.

Thanks for letting me know.

I presented the FQ-PIE ID in the recently concluded IETF at tsvwg. I believe there was interest in the group to have a specification for FQ-PIE.

It would be great if you could share your views on the tsvwg mailing list when you get a chance.

Thanks and Regards,

Mohit P. Tahiliani