<div dir="ltr"><div dir="auto">In the past I've seen issues with Windows Updates because the CDN was 1 ms away. TCP wants to have 2 segments in flight, resulting in a non-responsive TCP stream below 13Mb/s. CDNs with low RTTs cause cause issues with low bandwidth connections. Not only does DSL tend to have a low first hop latency, it also tends to have less bandwidth than cable, making it a prime victim for on-site CDNs.</div><div dir="auto"><br></div><div>I just attempted to install a game(about 1GiB) from Steam and it quickly made about 20 connections to my ISP's on-site CDN. Even if you assume a 10ms ping for someone with DSL, that's a minimum of about 1.3Mb/s per TCP steam. Below that, TCP becomes unresponsive to congestion. 20 connections times 1.3Mb/s is 26Mb/s of packet flooding power.</div><div class="gmail_extra"><br><div class="gmail_quote">On Jan 27, 2017 10:15 AM, "Dave Taht" <<a href="mailto:dave.taht@gmail.com" target="_blank">dave.taht@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">All over the net I hear of the bloated horrors steam and windows 10<br>
updates are inflicting on people, and several saying that inbound<br>
shaping isn't helping. I finally got two captures of a steam download<br>
here:<br>
<br>
<a href="https://github.com/tohojo/sqm-scripts/issues/43#issuecomment-275281826" rel="noreferrer" target="_blank">https://github.com/tohojo/sqm-<wbr>scripts/issues/43#issuecomment<wbr>-275281826</a><br>
<br>
And aside from some potential oddities (window, timestamp) didn't see<br>
anything terribly odd in the first trace I got there. Could someone<br>
take a look with smarter eyeballs than I have?<br>
<br>
--<br>
Dave Täht<br>
Let's go make home routers and wifi faster! With better software!<br>
<a href="http://blog.cerowrt.org" rel="noreferrer" target="_blank">http://blog.cerowrt.org</a><br>
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