From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr1-x436.google.com (mail-wr1-x436.google.com [IPv6:2a00:1450:4864:20::436]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id F329A3B29D for ; Fri, 13 Jan 2023 12:26:30 -0500 (EST) Received: by mail-wr1-x436.google.com with SMTP id r2so21710068wrv.7 for ; Fri, 13 Jan 2023 09:26:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=A0xn9vlHsUyVVJSIhg4J2hR0j3EHFHiPE8te+p8gLxo=; b=BHx5qmbR0dMjHYKM/hCxT1PX/xuRyXbV7r1RxHZDJ4rQT/cO++Cnwp6sNQLTuIJ1D/ cvVYgXZGsjQe4egyqyZceqHc0nm81E4/QE11X5TDkpA8GxT7mJOCoYhN/STvsM2aP/6P spi1wt9Ji3QiUl+vhD8DYivZf81rS29XbE6x9mbSjwNZJHiyeGhGid658D0T18BcLhdl 5Yc7bR8kwvZjz6Xw4OXtxHxuOGnxf73M2Rl3La5GGKp2hlmrfTjNAk5TpQf0IQUgmeqY YXwFIiuiJXRQPWuN0UmNFs5DqePqMZu7TN5+IQK4IEeSYNwVSJ1SEWahKNFo/I4jhjdk eSWQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=A0xn9vlHsUyVVJSIhg4J2hR0j3EHFHiPE8te+p8gLxo=; b=z80xKGldTfMc7jHV7ml1HWEszR4LxEGi2B5+OzcYc5bJ6UFCaJkyKZ/OU69sDZohTQ n5+nFuLhtHwWHuUVSPI9tblJJr7d9d09WKHppWXpzuLNIkorpJYEFcKcSunGa9YjG+lj etpPG7aXqEScXcDZ8Iu/5DuwEPufJBv6L0IDyAD05IKx4f2slxE9VPte+0WwpaHiX69R gbjrQ/hrUebNqIF2HUdDuo7wiipem9zsC0naEqnC6JthKsr7AR0c4qpauv3hX6LyUf7I 0mTp1+AOEeeWNQKK/jrtpazftDHFhQqwv/oW8+Fs6JTN3sWlaRQjAMBrOCEJaDgMqC3S RIMg== X-Gm-Message-State: AFqh2kpJ/+9xHsM26Pugbc914vDEiEdMgw+p9pVRPKWwKA/RAnew9AwC I5noufqEGENaIxBDv8+AS7JjTFsgoU+AtfV8yWu8QU876zk= X-Google-Smtp-Source: AMrXdXuB8w//ZXaXVzmfjkFDDsRd+IGjtQsOP3tCY/mvu2EKwe9+uOLlsGp8ItXfOLG3CDqzz80RXI/TQawV5V7/M2I= X-Received: by 2002:a5d:604d:0:b0:2bb:ea44:2b5a with SMTP id j13-20020a5d604d000000b002bbea442b5amr478904wrt.430.1673630789682; Fri, 13 Jan 2023 09:26:29 -0800 (PST) MIME-Version: 1.0 References: <89D796E75967416B9723211C183A8396@SRA6> <3696AEA5409D4303ABCBC439727A5E40@SRA6> In-Reply-To: From: Dave Taht Date: Fri, 13 Jan 2023 09:26:18 -0800 Message-ID: To: Jonathan Bennett Cc: Ulrich Speidel , starlink@lists.bufferbloat.net Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: Re: [Starlink] insanely great waveform result for starlink X-BeenThere: starlink@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: "Starlink has bufferbloat. Bad." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Jan 2023 17:26:31 -0000 packet caps would be nice... all this is very exciting news. I'd so love for one or more of y'all reporting such great uplink results nowadays to duplicate and re-plot the original irtt tests we did: irtt client -i3ms -d300s myclosestservertoyou.starlink.taht.net -o whatever= .json They MUST have changed their scheduling to get such amazing uplink results, in addition to better queue management. (for the record, my servers are de, london, fremont, sydney, dallas, newark, atlanta, singapore, mumbai) There's an R and gnuplot script for plotting that output around here somewhere (I have largely personally put down the starlink project, loaning out mine) - that went by on this list... I should have written a blog entry so I can find that stuff again. On Fri, Jan 13, 2023 at 9:02 AM Jonathan Bennett via Starlink wrote: > > > On Fri, Jan 13, 2023 at 6:28 AM Ulrich Speidel via Starlink wrote: >> >> On 13/01/2023 6:13 pm, Ulrich Speidel wrote: >> > >> > From Auckland, New Zealand, using a roaming subscription, it puts me >> > in touch with a server 2000 km away. OK then: >> > >> > >> > IP address: nix six. >> > >> > My thoughts shall follow later. >> >> OK, so here we go. >> >> I'm always a bit skeptical when it comes to speed tests - they're really >> laden with so many caveats that it's not funny. I took our new work >> Starlink kit home in December to give it a try and the other day finally >> got around to set it up. It's on a roaming subscription because our >> badly built-up campus really isn't ideal in terms of a clear view of the >> sky. Oh - and did I mention that I used the Starlink Ethernet adapter, >> not the WiFi? >> >> Caveat 1: Location, location. I live in a place where the best Starlink >> promises is about 1/3 in terms of data rate you can actually get from >> fibre to the home at under half of Starlink's price. Read: There are few >> Starlink users around. I might be the only one in my suburb. >> >> Caveat 2: Auckland has three Starlink gateways close by: Clevedon (which >> is at a stretch daytrip cycling distance from here), Te Hana and Puwera, >> the most distant of the three and about 130 km away from me as the crow >> flies. Read: My dishy can use any satellite that any of these three can >> see, and then depending on where I put it and how much of the southern >> sky it can see, maybe also the one in Hinds, 840 km away, although that >> is obviously stretching it a bit. Either way, that's plenty of options >> for my bits to travel without needing a lot of handovers. Why? Easy: If >> your nearest teleport is close by, then the set of satellites that the >> teleport can see and the set that you can see is almost the same, so you >> can essentially stick with the same satellite while it's in view for you >> because it'll also be in view for the teleport. Pretty much any bird >> above you will do. >> >> And because I don't get a lot of competition from other users in my area >> vying for one of the few available satellites that can see both us and >> the teleport, this is about as good as it gets at 37S latitude. If I'd >> want it any better, I'd have to move a lot further south. >> >> It'd be interesting to hear from Jonathan what the availability of home >> broadband is like in the Dallas area. I note that it's at a lower >> latitude (33N) than Auckland, but the difference isn't huge. I notice >> two teleports each about 160 km away, which is also not too bad. I also >> note Starlink availability in the area is restricted at the moment - >> oversubscribed? But if Jonathan gets good data rates, then that means >> that competition for bird capacity can't be too bad - for whatever reaso= n. > > I'm in Southwest Oklahoma, but Dallas is the nearby Starlink gateway. In = cities, like Dallas, and Lawton where I live, there are good broadband opti= ons. But there are also many people that live outside cities, and the optio= ns are much worse. The low density userbase in rural Oklahoma and Texas is = probably ideal conditions for Starlink. >> >> >> Caveat 3: Backhaul. There isn't just one queue between me and whatever I >> talk to in terms of my communications. Traceroute shows about 10 hops >> between me and the University of Auckland via Starlink. That's 10 >> queues, not one. Many of them will have cross traffic. So it's a bit >> hard to tell where our packets really get to wait or where they get >> dropped. The insidious bit here is that a lot of them will be between 1 >> Gb/s and 10 Gb/s links, and with a bit of cross traffic, they can all >> turn into bottlenecks. This isn't like a narrowband GEO link of a few >> Mb/s where it's obvious where the dominant long latency bottleneck in >> your TCP connection's path is. Read: It's pretty hard to tell whether a >> drop in "speed" is due to a performance issue in the Starlink system or >> somewhere between Starlink's systems and the target system. >> >> I see RTTs here between 20 ms and 250 ms, where the physical latency >> should be under 15 ms. So there's clearly a bit of buffer here along the >> chain that occasionally fills up. >> >> Caveat 4: Handovers. Handover between birds and teleports is inevitably >> associated with a change in RTT and in most cases also available >> bandwidth. Plus your packets now arrive at a new queue on a new >> satellite while your TCP is still trying to respond to whatever it >> thought the queue on the previous bird was doing. Read: Whatever your >> cwnd is immediately after a handover, it's probably not what it should b= e. >> >> I ran a somewhat hamstrung (sky view restricted) set of four Ookla >> speedtest.net tests each to five local servers. Average upload rate was >> 13 Mb/s, average down 75.5 Mb/s. Upload to the server of the ISP that >> Starlink seems to be buying its local connectivity from (Vocus Group) >> varied between 3.04 and 14.38 Mb/s, download between 23.33 and 52.22 >> Mb/s, with RTTs between 37 and 56 ms not correlating well to rates >> observed. In fact, they were the ISP with consistently the worst rates. >> >> Another ISP (MyRepublic) scored between 11.81 and 21.81 Mb/s up and >> between 106.5 and 183.8 Mb/s down, again with RTTs badly correlating >> with rates. Average RTT was the same as for Vocus. >> >> Note the variation though: More or less a factor of two between highest >> and lowest rates for each ISP. Did MyRepublic just get lucky in my >> tests? Or is there something systematic behind this? Way too few tests >> to tell. >> >> What these tests do is establish a ballpark. >> >> I'm currently repeating tests with dish placed on a trestle closer to >> the heavens. This seems to have translated into fewer outages / ping >> losses (around 1/4 of what I had yesterday with dishy on the ground on >> my deck). Still good enough for a lengthy video Skype call with my folks >> in Germany, although they did comment about reduced video quality. But >> maybe that was the lighting or the different background as I wasn't in >> my usual spot with my laptop when I called them. > > Clear view of the sky is king for Starlink reliability. I've got my dishy= mounted on the back fence, looking up over an empty field, so it's pretty = much best-case scenario here. >> >> >> -- >> >> **************************************************************** >> Dr. Ulrich Speidel >> >> School of Computer Science >> >> Room 303S.594 (City Campus) >> >> The University of Auckland >> u.speidel@auckland.ac.nz >> http://www.cs.auckland.ac.nz/~ulrich/ >> **************************************************************** >> >> >> >> _______________________________________________ >> Starlink mailing list >> Starlink@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/starlink > > _______________________________________________ > Starlink mailing list > Starlink@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/starlink --=20 This song goes out to all the folk that thought Stadia would work: https://www.linkedin.com/posts/dtaht_the-mushroom-song-activity-69813666656= 07352320-FXtz Dave T=C3=A4ht CEO, TekLibre, LLC