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The CoDel queue management algorithmThe CoDel queue management algorithmPosted May 29, 2012 9:13 UTC (Tue) by Cyberax (✭ supporter ✭, #52523)In reply to: The CoDel queue management algorithm by raven667 Parent article: The CoDel queue management algorithm
>cyberax@cybnb:~$ traceroute lwsrv
>traceroute to lwsrv (94.45.58.146), 30 hops max, 60 byte packets > 1 192.168.18.100 (192.168.18.100) 3.236 ms 3.237 ms 3.247 ms > 2 unallocated.sta.lan.com.ua (92.249.102.1) 3.256 ms 3.263 ms 3.272 ms > 3 out.ua-ix.lan.com.ua (92.249.120.249) 45.030 ms 45.046 ms 45.021 ms > 4 dtel-ix.as6723.net (193.25.180.61) 3.197 ms 5.642 ms 5.714 ms > 5 j2-ua.gw.skif.com.ua (91.90.19.210) 6.323 ms 6.332 ms 8.713 ms > 6 something.com.ua (94.45.x.x) 3.012 ms 5.023 ms 17.928 ms
That's a trace from my residential 100Mb to my office (some 30km away). And I pay $6 a month for it.
You Americans are stuck in a stone age :)
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The CoDel queue management algorithm Posted May 29, 2012 15:06 UTC (Tue) by nye (guest, #51576) [Link]
Well I'm from the UK, so my national bias is to assume that 'residential' == 'ADSL', where I don't believe it's technically possible to get pings that low. In some places you can get cable (with a choice of Virgin Media or... Virgin Media) and while I don't know so much about that, by reputation the ping times are at least as bad, often worse.
Over the last couple of years we've been seeing a major upgrade rollout, which means that people in urban areas have a fairly good chance of getting VDSL2, though there's only one wholesale provider and IIUC everyone offering it is reselling exactly the same product, which has fairly low caps until you start paying crazy money (eg £25-30/month for a 30GB limit, or ~£75 if you go all the way up to 180GB).
I don't actually know if VDSL2 is any better in terms of latency though, quite possibly not. Personally I'm relatively happy with my un-capped ~10Mb ADSL2 connection for £18/month, that usually only drops out for a couple of minutes at a time a few times per day (emphasis on 'relatively'). The national average is far worse than that, but we're only about 450m from the exchange.
Do you know what technology you're using?
The CoDel queue management algorithm Posted May 29, 2012 15:23 UTC (Tue) by Cyberax (✭ supporter ✭, #52523) [Link]
Sure. I live in apartment building and get Ethernet to my router (actually, to my Linux machine), with simple static IP assignment (no DHCP, PPP, etc). I can also get routed networks up to /28 if I need it for small additional price.
Apartment building is connected by 10G fiber to my provider's hub which is connected to the main national Internet traffic exchange ( http://www.ua-ix.net.ua/eng.phtml ). It's simple and fast, and works great in dense residential areas.
In contrast, I have to pay $50 a month for 30/5 cable connection when I live in Brooklyn in the US. And it's still considered to be pretty cheap :(
The CoDel queue management algorithm Posted Jul 25, 2012 12:13 UTC (Wed) by farnz (guest, #17727) [Link] All DSL technologies in current use run at a 4 kilobaud signalling rate; higher speeds are provided by running more bits per symbol, so your 10MBit/s ADSL2 is 2,500 bits per symbol, while 40M VDSL2 would be 10,000 bits per symbol. This puts a lower bound on DSL latency of 0.25 milliseconds; practically, VDSL2 seems able to reliably reach the 5ms RTT range for the DSL link itself, while my home ADSL2+ has around 25ms RTT.
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