<div dir="ltr"><div>Hi Dave,</div><div><br></div><div>Yes definitely, when fair-queuing is present, the onus is no longer on the congestion control algorithm to ensure fairness. In fact, if buffer-sharing is implemented correctly, FQ can even stand against adversarial congestion control algorithms. We have good reason to believe that end-to-end congestion control algorithms can provably work (i.e. achieve high utilization, bounded delay and fairness) in the presence of FQ.</div><div><br></div><div>Cheers,<br></div><div>Venkat<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Aug 5, 2022 at 12:36 AM Dave Taht <<a href="mailto:dave.taht@gmail.com">dave.taht@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Perhaps it's obvious to the authors that FQ opens up new possibilities<br>
for delay based convergence. Otherwise, pretty good:<br>
<br>
"We prove that when two flows using the same CCA share a bottleneck<br>
link, if the non-congestive delay variations exceed double the<br>
difference between the maximum and minimum queueing delay at<br>
equilibrium, then there are patterns of non-congestive delay where one<br>
flow will get arbitrarily low throughput compared to the other. Our<br>
theorem shows that CCAs have<br>
to choose at most two out of three properties: high through put,<br>
convergence to a small and bounded delay range, and no starvation."<br>
<br>
Paper: <a href="http://people.csail.mit.edu/venkatar/cc-starvation.pdf" rel="noreferrer" target="_blank">http://people.csail.mit.edu/venkatar/cc-starvation.pdf</a><br>
<br>
Article: <a href="https://news.mit.edu/2022/algorithm-computer-network-bandwidth-0804" rel="noreferrer" target="_blank">https://news.mit.edu/2022/algorithm-computer-network-bandwidth-0804</a><br>
<br>
<br>
<br>
-- <br>
FQ World Domination pending: <a href="https://blog.cerowrt.org/post/state_of_fq_codel/" rel="noreferrer" target="_blank">https://blog.cerowrt.org/post/state_of_fq_codel/</a><br>
Dave Täht CEO, TekLibre, LLC<br>
</blockquote></div>