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<blockquote type="cite"><span style="-webkit-text-size-adjust: auto; caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">The thing is that the pandemic has changed the game on the ground: there is an actual feature differentiator
to be had. But having dealt with the Linksys folks in the past I don't put out much hope that they'll take advantage of it. The software development side was a vast black hole where time stands still. It seems the entire industry is like that.</span></blockquote>
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<div><font color="#000000"><span style="caret-color: rgb(0, 0, 0); -webkit-text-size-adjust: auto; background-color: rgb(255, 255, 255);">Michael,</span></font></div>
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<div><font color="#000000"><span style="caret-color: rgb(0, 0, 0); -webkit-text-size-adjust: auto; background-color: rgb(255, 255, 255);">Even 100 Mbps Internet is fine for Zoom, as long as the uplink speed is at least 10 Mbps. The average zoom session requires
2 Mbps up and down, and even for the lavish six-screen executive sessions, 6 Mbps is plenty good. So arguing that 10 GbE is necessary because “pandemic has changed the game on the ground” is silly. </span></font></div>
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<div><a href="https://support.zoom.us/hc/en-us/articles/204003179-System-requirements-for-Zoom-Rooms#h_b48c2bfd-7da0-4290-aae8-784270d3ab3f">https://support.zoom.us/hc/en-us/articles/204003179-System-requirements-for-Zoom-Rooms#h_b48c2bfd-7da0-4290-aae8-784270d3ab3f</a></div>
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<div><span style="background-color: rgb(255, 255, 255);">So, sorry, 10 GbE is a hobbyists fantasy, not a marketable product. If hobbyists want 10GbE, let them pay for it like the rest of us, and let them play CoD from inside freezing data center :)<br>
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<div dir="ltr"> -mel</div>
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<blockquote type="cite">On Dec 26, 2020, at 11:12 AM, Filip Hruska <fhr@fhrnet.eu> wrote:<br>
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<div dir="ltr"> I wouldn't rely on these numbers too much, your testing methodology is flawed.<br>
People don't expect RING nodes to be used as speedtest servers and so they are usually not connected to high speed networks.
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Using a classical speedtest.net (Web or CLI) application would make much more sense, given the servers are actually connected to high speed Internet and are tuned to achieve such speeds - which is much more akin to how the most bandwidth demanding stuff (streaming,
game downloads, system updates from CDNs) behaves. <br>
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It's certainly possible to get 1G+ over >10ms RTT connections single stream - the buffers are certainly not THAT small for it to be a problem - not to mention game distribution platforms do usually open multiple connections to maximise the bandwidth utilisation.
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Re 85KB: that's just the initial window size, which will grow given tcp window scaling is enabled (default on modern Linux).
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Filip<br>
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<div class="gmail_quote">On 26 December 2020 19:14:13 CET, Baldur Norddahl <baldur.norddahl@gmail.com> wrote:
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<div dir="ltr" class="gmail_attr">lør. 26. dec. 2020 18.55 skrev Mikael Abrahamsson <<a href="mailto:swmike@swm.pp.se">swmike@swm.pp.se</a>>:<br>
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On Sat, 26 Dec 2020, Baldur Norddahl wrote:<br>
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> It is true there have been TCP improvements but you can very easily verify<br>
> for yourself that it is very hard to get anywhere near 1 Gbps of actual<br>
> transfer speed to destinations just 10 ms away. Try the nlnog ring network<br>
> like this:<br>
><br>
> gigabit@gigabit01:~$ iperf -c <a href="http://netnod01.ring.nlnog.net" rel="noreferrer noreferrer" target="_blank">
netnod01.ring.nlnog.net</a><br>
> ------------------------------------------------------------<br>
> Client connecting to <a href="http://netnod01.ring.nlnog.net" rel="noreferrer noreferrer" target="_blank">
netnod01.ring.nlnog.net</a>, TCP port 5001<br>
> TCP window size: 85.0 KByte (default)<br>
> ------------------------------------------------------------<br>
> [ 3] local 185.24.168.23 port 50632 connected with 185.42.136.5 port 5001<br>
> [ ID] Interval Transfer Bandwidth<br>
> [ 3] 0.0-10.0 sec 452 MBytes 379 Mbits/sec<br>
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Why would you just use 85KB of TCP window size?<br>
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That's not the problem of buffering (or lack thereof) along the path, that <br>
just not enough TCP window size for long-RTT high speed transfers.<br>
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<div dir="auto">That is just the starting window size. Also it is the default and I am not going to tune the connection because no such tuning will occur when you do your next far away download and wonder why it is so slow. </div>
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<div dir="auto">If you do the math you will realise that 379 Mbps at 10 ms is impossible with 85 K window.</div>
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<div dir="auto">I demonstrated that it is about buffers by showing the same download from a server that paces the traffic indeed gets the full 930 Mbps with exactly the same settings, including starting window size, and the same path (Copenhagen to Stockholm).</div>
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<div dir="auto">Regards</div>
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<div dir="auto">Baldur </div>
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-- <br>
Sent from my Android device with K-9 Mail. Please excuse my brevity.</div>
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