<html><head></head><body>In particular, the DUT should probably have no more than 2 packets of outbound queueing given the very small RTT. 2xRTT is the most buffering you want in the loop.<br clear="none"><br clear="none"><div class="gmail_quote">On Oct 23, 2015, Richard Smith <smithbone@gmail.com> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<pre class="k10mail">On 10/23/2015 02:41 PM, Michael Richardson wrote:<br clear="none"></pre><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;">Richard Smith <smithbone@gmail.com> wrote:<br clear="none"><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #ad7fa8; padding-left: 1ex;">My test setup:<br clear="none"><br clear="none">Laptop<--1000BaseT-->DUT<--1000baseT-->Server</blockquote><br clear="none">So, given that the DUT is the only real constraint in the network, what<br clear="none">do you expect to see from this setup?<br clear="none"><br clear="none">Given that the probably DUT can't forward at Gb/s, and it certainly can't<br clear="none">shape anything, it's gonna drop packets, and it's probably gonna drop them in<br clear="none">Rx, having overrun the Rx-queue (so tail-drop). If there is too much ram<br clear="none">(bufferbloated), then you'll see different results...</blockquote><br clear="none">Setting ingress/egress to 10Mbit/s I expected to see the speed <br clear="none">measurements bounce around those limits with the ping times staying in <br clear="none">the low double digits of ms. What I saw however, was the data rates <br clear="none">going well past 10Mbit limit and pings up to 2000 ms.<br clear="none"><br clear="none">This is what I've seen in prior rrul testing using a the 50/10 cable <br clear="none">link at our office and my 25(ish)/6 link at my apartment and a well <br clear="none">connected server on the net. That however was using QoS and not SQM.<br clear="none"><br clear="none">Its that a reasonable expectation?<br clear="none"></blockquote></div><br clear="none">-- Sent with <b><a shape="rect" href="https://play.google.com/store/apps/details?id=com.onegravity.k10.pro2">K-@ Mail</a></b> - the evolution of emailing.</body></html>