<div dir="ltr">I dug out the info from the friend of mine doing this testing, and he was about to get the dslreports_8dn test to deliver ~800Mbps from his server, but only ~122Mbps from <a href="http://flent-freemont.bufferbloat.net">flent-freemont.bufferbloat.net</a>. Which is awfully suspicious that this is a setup issue with the node in fremont.</div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Sep 21, 2017 at 8:16 AM, Aaron Wood <span dir="ltr"><<a href="mailto:woody77@gmail.com" target="_blank">woody77@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">The friend of mine that I've been working with brought up a cloud node somewhere with ubuntu and netperf on it, and from another location (business internet) able to consistently get better throughput from his cloud node setup than from the flent-fremont node. We're starting to think that it's something about that node in particular. It seems to have a 125Mbps cap (so I guess about a 140-150Mbps line-rate cap?).<div><br></div><div>What kind of node is it running on?</div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Sep 21, 2017 at 8:13 AM, Aaron Wood <span dir="ltr"><<a href="mailto:woody77@gmail.com" target="_blank">woody77@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I'd wondered about single vs. multiple, but I'm getting pretty consistent speeds from the flent-fremont node irrespective of the number of streams that I use (1, 4, 12, etc). </div><div class="m_-1448213421985973616HOEnZb"><div class="m_-1448213421985973616h5"><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Sep 21, 2017 at 7:50 AM, Colin Dearborn <span dir="ltr"><<a href="mailto:Colin.Dearborn@sjrb.ca" target="_blank">Colin.Dearborn@sjrb.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">This is my guess.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">DSL reports uses many streams from different servers to achieve these speeds.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">I’m assuming flent is a single stream, so you’re at the mercy of TCP receive windows and latency limiting how fast you can go on that single stream.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Bloat [mailto:<a href="mailto:bloat-bounces@lists.bufferbloat.net" target="_blank">bloat-bounces@lists.bu<wbr>fferbloat.net</a>]
<b>On Behalf Of </b>Aaron Wood<br>
<b>Sent:</b> Tuesday, August 29, 2017 11:16 PM<br>
<b>To:</b> bloat <<a href="mailto:bloat@lists.bufferbloat.net" target="_blank">bloat@lists.bufferbloat.net</a>><br>
<b>Subject:</b> [Bloat] different speeds on different ports? (benchmarking fun)<u></u><u></u></span></p><div><div class="m_-1448213421985973616m_-7946510760689942622h5">
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<p class="MsoNormal">I don't have a full writeup yet, but wanted to ask if people on here have run into this. <u></u><u></u></p>
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<p class="MsoNormal">I'm seeing a disparity between flent and the dslreports speed tests. On my connection at home (Comcast 150/12), I figured it was something related to the test implementations, but minor. But on a connect at a friend with business-class
Comcast (300/12), we're seeing a huge difference. Flent can't seem to achieve more than 120Mbps, often with an early, couple-second hump at a much higher speed. But dslreports' speed tests gets the full 300Mbps.<u></u><u></u></p>
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<p class="MsoNormal">In looking closer at my connection, with sqm (cake) turned off, I'm seeing ~180Mbps download with 500ms of bufferbloat when I use the dslreports test (<a href="http://www.dslreports.com/speedtest/20805152" target="_blank">http://www.dslreports.com/spe<wbr>edtest/20805152</a>).<u></u><u></u></p>
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<p class="MsoNormal">Yet flent can't come close to that, even with the tcp_12down test:<u></u><u></u></p>
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<p class="MsoNormal">The current hypothesis that we have is that this is due to either traffic class, or the ports that traffic are running on. I've ruled out the ping streams, as a parallel set of netperf tcp_maerts downloads has the same 120Mbps roof.<u></u><u></u></p>
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<p class="MsoNormal">It would be interesting if we could run some netperf tests using port 80/443 for the listening socket for the data connection (although if doing deep-packet inspection, we might need to use an actual HTTP transfer).<u></u><u></u></p>
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<p class="MsoNormal">-Aaron<u></u><u></u></p>
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