<div dir="auto"><div dir="auto"><br></div><div dir="auto">The 12 seconds of jitter and 98% of the packets being tagged as "late packets" really, really points to a pretty bad buffer bloat problem.</div><div dir="auto"><br></div><div dir="auto">If other customers are seeing similar problems, it could be a cascading series of large buffer devices along a pathway with an intermittently congested series of upstream links beyond them, so what you're seeing isn't just packets being stuck in a single large buffer, but a procession of large buffers, each of which adds delay and loss.</div><div dir="auto"><br></div><div dir="auto">Definitely not a good customer experience, that's for sure. ^_^;</div><div dir="auto"><br></div><div dir="auto">Matt</div><div dir="auto"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Feb 19, 2022, 20:34 Chapman, Brad (NBCUniversal) <<a href="mailto:Brad.Chapman@nbcuni.com">Brad.Chapman@nbcuni.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="auto">
<div dir="ltr"><a href="http://devicetests.com" target="_blank" rel="noreferrer">devicetests.com</a> is interesting. However, the latency / packet loss test is only capable of blasting a max of 450 KB/s (3.6Mbps) even when cranked to its maximum silliness... but his sample shows a
<b><u>steadily increasing</u></b> ping time over the length of the test. That's strange. </div>
<div dir="ltr">
<div><br>
</div>
<div>It could be an oversubscribed line, or the original repair wasn't done right (or has failed again), or he just doesn't have sufficient bandwidth to stream at all.</div>
<div>
<div><br>
</div>
<div>1. What is his chosen streaming platform?</div>
<div><br>
</div>
<div>2. What is the resolution, frame rate, bitrate etc?</div>
<div><br>
</div>
<div>3. What is his <b>contracted</b> upload rate from Mediacom ("up to ____ Mbps upload")?</div>
<div><br>
</div>
<div>4. Has he run a 24-hour twitch stream to track the latency around the clock? Maybe there's a pattern.</div>
<div><br>
</div>
<div><br>
<div dir="ltr">—Sent from my iPhone</div>
<div dir="ltr"><br>
<blockquote type="cite">On Feb 19, 2022, at 7:46 PM, Chad Austin <<a href="mailto:me@chadaustin.org" target="_blank" rel="noreferrer">me@chadaustin.org</a>> wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr"><span>22 seconds of latency?</span><br>
<span></span><br>
<span>Do you have gigabytes of buffers, or is something sending pause frames?</span><br>
<span></span><br>
<span>+1 to 'did you plug your PC into the modem directly?'</span><br>
<span></span><br>
<span>-Chad</span><br>
<span></span><br>
<span>On 2/19/2022 9:57 PM, Scott Buettner wrote:</span><br>
<blockquote type="cite"><span>The cable carrier has done the standard "have him powercycle then send a tech out" and the techs have not found a problem in this most recent issue. (He had a similar problem in December that WAS line related and was resolved in
early Jan by the carrier techs). Unfortunately he's on residential class service at the moment (which I am trying to persuade him to correct) so the level of support we're getting from the Tier 1 folks isn't ideal.</span><br>
</blockquote>
<blockquote type="cite"><span>He's scheduling another tech dispatch with them now, just to be safe.</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>It's hitting TCP and UDP both, which is just manifesting in "slowness" on TCP of course. It's most relevant over UDP as he is a professional streamer and the most prominent symptom is frame drops on that, and I've confirmed it
is affecting his connection in general, the issue is not specific to that service. I had him grab a packet loss test using <a href="http://devicetests.com" target="_blank" rel="noreferrer">devicetests.com</a> (which looks to be based on WebRTC for the test) and we managed to grab results of it actively happening here: <a href="https://urldefense.com/v3/__https://dast-files.s3.us-east-2.amazonaws.com/packets.jpg__;!!PIZeeW5wscynRQ!78RScPexz65Gc0_sIwuwdK43Y9sa-rcED6XtN-khol5rNm3Sl80znvDY-x1vXl_u4w$" target="_blank" rel="noreferrer">https://urldefense.com/v3/__https://dast-files.s3.us-east-2.amazonaws.com/packets.jpg__;!!PIZeeW5wscynRQ!78RScPexz65Gc0_sIwuwdK43Y9sa-rcED6XtN-khol5rNm3Sl80znvDY-x1vXl_u4w$</a>
</span><br>
</blockquote>
<blockquote type="cite"><span>He's replaced the modem and router both in the last 3 months, along with the cables.</span><br>
</blockquote>
<blockquote type="cite"><span>It's very intermittent, bursts of packet loss over a few minutes, then fine for some period of time (minutes to hours).</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>He's informed me that a colleague of his located about 4 hours away on the same ISP is experiencing similar issues, but that individual is not a client of mine so I don't have anything concrete from that endpoint currently.</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>I'm happy to keep discussing/troubleshooting, but I would like to avoid spamming the rest of the list (even -discuss), so feel free to email me directly.</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>-----Original Message-----</span><br>
</blockquote>
<blockquote type="cite"><span>From: Jay R. Ashworth <<a href="mailto:jra@baylink.com" target="_blank" rel="noreferrer">jra@baylink.com</a>></span><br>
</blockquote>
<blockquote type="cite"><span>Sent: Saturday, February 19, 2022 7:18 PM</span><br>
</blockquote>
<blockquote type="cite"><span>To: Scott Buettner <<a href="mailto:DasterinTempus@outlook.com" target="_blank" rel="noreferrer">DasterinTempus@outlook.com</a>></span><br>
</blockquote>
<blockquote type="cite"><span>Cc: <a href="mailto:outages-discussion@outages.org" target="_blank" rel="noreferrer">outages-discussion@outages.org</a></span><br>
</blockquote>
<blockquote type="cite"><span>Subject: Re: [Outages-discussion] Mediacom intermittent packet loss</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>----- Original Message -----</span><br>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>From: "Scott Buettner" <<a href="mailto:DasterinTempus@outlook.com" target="_blank" rel="noreferrer">DasterinTempus@outlook.com</a>></span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>I hate to ask since this isn't really the forum, but I'm sort of out of ideas:</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>Would anyone from MediacomCable be able to reach out to me offlist?</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>I'm not gonna call it an outage, but I have a client on their service</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>who is having crippling intermittent upload packet loss (~85%) for</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>most of this month, calls from him to phone support have not resulted</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>in a resolution and it's seriously affecting his home business.</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span></span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>Thanks in advance if anyone can assist, and sorry to bother everyone otherwise.</span><br>
</blockquote>
</blockquote>
<blockquote type="cite">
<blockquote type="cite"><span>--Samantha</span><br>
</blockquote>
</blockquote>
<blockquote type="cite"><span>The cable carrier has confirmed there's not a low-signal problem on the link, and other first-level stuff like that? Do they have their own router, have they plugged directly into the cablemodem for test (after a powercycle)?</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>What protocol isn't working, does other stuff not work too?</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>You're right, this is usually out-of-scope for Outages, but at least you posted it on -discuss. :-)</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>Cheers,</span><br>
</blockquote>
<blockquote type="cite"><span>-- jra</span><br>
</blockquote>
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