<div dir="ltr">Dear researchers,<div>I would greatly appreciate your insight into the following problem:</div><div><br></div><div><div>Consider the following setup: I have a laptop connected on 100Mbps Ehternet to a router equipped with an LTE SIM and antennas. I run flent tests on an Ubuntu VM on my laptop.I am trying to assess/compare performance of different algorithms on bufferbloat mitigation on LTE links. FQ_Codel when applied, was applied on the router box itself directly.</div><div><br></div><div>The results for TCP BBR in any combination seem really underwhelming. I turned BBR on on my VM manually, by going to /etc/sysctl.conf and adding net.ipv4.tcp_congestion_control=bbr and net.core.default_qdisc=fq. Then I issue a sysctl -p to refresh. </div><div><br></div><div>I ran flent rrul test, and also in some tests used netem to induce packet loss. With or without induced loss, BBR still underperformed. Attached please see the graphs. Is this expected? Has anyone seen something like this? I would really appreciate any insight you might have into this.</div><div><br></div><div><div><img src="cid:ii_jr7xcodj2" alt="image.png" width="562" height="421"><br></div></div><div><div><img src="cid:ii_jr7xd1g93" alt="image.png" width="562" height="421"><br></div></div><div><br></div><div><br></div><div>Thanks a lot</div><div>Best</div><div>Azin</div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jan 18, 2019 at 5:00 PM Azin Neishaboori <<a href="mailto:azin.neishaboori@gmail.com">azin.neishaboori@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"><div dir="ltr">Dear all<div>I know I have already asked a question recently. But I hope you consider reading this question:</div><div><br></div><div>Consider the following setup: I have a laptop connected on 100Mbps Ehternet to a router equipped with an LTE SIM and antennas. I run flent tests on an Ubuntu VM on my laptop.I am trying to assess/compare performance of different algorithms on bufferbloat mitigation on LTE links. FQ_Codel when applied, was applied on the router box itself directly.</div><div><br></div><div>The results for TCP BBR in any combination seem really underwhelming. I turned BBR on on my VM manually, by going to /etc/sysctl.conf and adding net.ipv4.tcp_congestion_control=bbr and net.core.default_qdisc=fq. Then I issue a sysctl -p to refresh. </div><div><br></div><div>I ran flent rrul test, and also in some tests used netem to induce packet loss. With or without induced loss, BBR still underperformed. Attached please see the graphs. Is this expected? Has anyone seen something like this? I would really appreciate any insight you might have into this.</div><div><br></div><div>Thanks a lot</div><div>Best</div><div>Azin</div><div><div><img src="cid:ii_jr2l0rt51" alt="image.png" width="472" height="355"><br></div></div><div><br></div><div>Here is with induced loss (1%, 2% and 4%):</div><div><div><img src="cid:ii_jr2l28xo2" alt="image.png" width="472" height="354"><br></div></div><div><br></div><div><div><br></div></div><div><br></div><div><br></div></div>
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