[Starlink] an rtt_fair test?
Dave Taht
dave.taht at gmail.com
Sun Apr 17 10:56:57 EDT 2022
Thank you for testing!!! If you could stash the *.flent.gz files
somewhere I could get at, that would be great. You can also browse the
plots using the flent-gui to see more detail over time.
Cake, long available as an out of tree build for the edgerouter, has
both dsl compensation and an ack-filter which would help A LOT, in
your case. i wish I'd pushed harder to get dsl compensation into the
edgerouter smart queues code...
https://community.ui.com/questions/Cake-compiled-for-the-EdgeRouter-devices/fc1ff27c-f321-4344-8737-fcc755cae8a2
Given your 500kbit upload speed the minimum latency inflation under
the structure of this test (4 upload flows) should have been around
150ms (4 * 25ms + ack overhead), but without looking at the *.gz files
I don't know what your baseline latency was to any of these sites. (it
would be good if flent reported on the text output what the minimum
actually was)
On Sun, Apr 17, 2022 at 7:35 AM <jordan at inacomptc.com> wrote:
>
> Hi Dave,
>
> This isn't specifically cake related but I figured it could be interesting, especially as these are from a location where I've been investigating setting up something with cake. These are statistics from a relatives location where they only have a DSL line from CenturyLink available to them. There's a little Debian based VM I setup for a couple random things so I was able to run flent from that. They have a EdgeRouter X serving as the router so they can at least take advantage of fq_codel through the routers Smart Queue feature. I ran a quick speed test, then ran flent without sqm, and then with sqm. Sorry if this gets a bit long and hopefully it stays readable.
>
> #############
> Speedtest by Ookla
>
> Server: 123.Net, Inc. - Southfield, MI (id = 15044)
> ISP: CenturyLink
> Latency: 45.45 ms (194.34 ms jitter)
> Download: 8.88 Mbps (data used: 12.6 MB )
> Upload: 0.64 Mbps (data used: 962.7 kB )
> Packet Loss: 5.1%
> Result URL: https://www.speedtest.net/result/c/799ba46b-d3d4-4d54-ac76-118fac847b73
>
> ###########
> No SQM or QOS
>
> flent -x --socket-stats --step-size=.05 -H de.starlink.taht.net -H london.starlink.taht.net -H singapore.starlink.taht.net -H fremont.starlink.taht.net -t nosqm_erx_rttfair4be_8Mbpsdown_500Kbpsup_centurylinkdsl rtt_fair4be
> Started Flent 2.0.0 using Python 3.9.2.
> Starting rtt_fair4be test. Expected run time: 70 seconds.
> Data file written to ./rtt_fair4be-2022-04-17T145553.865990.nosqm_erx_rttfair4be_8Mbpsdown_500Kbpsup_centurylinkdsl.flent.gz
>
> Summary of rtt_fair4be test run from 2022-04-17 13:55:53.865990
> Title: 'nosqm_erx_rttfair4be_8Mbpsdown_500Kbpsup_centurylinkdsl'
>
> avg median # data pts
> Ping (ms) ICMP1 de.starlink.taht.net : 1026.06 920.00 ms 1383
> Ping (ms) ICMP2 london.starlink.taht.net : 1009.28 887.00 ms 1383
> Ping (ms) ICMP3 singapore.starlink.taht.net : 1121.09 1012.00 ms 1383
> Ping (ms) ICMP4 fremont.starlink.taht.net : 943.77 853.00 ms 1383
> Ping (ms) avg : 1025.05 N/A ms 1383
> TCP download BE1 de.starlink.taht.net : 1.36 2.00 Mbits/s 1383
> TCP download BE2 london.starlink.taht.net : 0.72 0.65 Mbits/s 1383
> TCP download BE3 singapore.starlink.taht.net : 1.03 1.74 Mbits/s 1383
> TCP download BE4 fremont.starlink.taht.net : 2.11 2.88 Mbits/s 1383
> TCP download avg : 1.30 N/A Mbits/s 1383
> TCP download fairness : 0.86 N/A Mbits/s 1383
> TCP download sum : 5.22 N/A Mbits/s 1383
> TCP upload BE1 de.starlink.taht.net : 0.12 0.20 Mbits/s 1383
> TCP upload BE1 de.starlink.taht.net::tcp_cwnd : 16.85 14.00 1044
> TCP upload BE1 de.starlink.taht.net::tcp_delivery_rate : 0.12 0.12 1036
> TCP upload BE1 de.starlink.taht.net::tcp_pacing_rate : 0.35 0.26 1042
> TCP upload BE1 de.starlink.taht.net::tcp_rtt : 1128.57 954.47 1020
> TCP upload BE1 de.starlink.taht.net::tcp_rtt_var : 68.22 50.08 1020
> TCP upload BE2 london.starlink.taht.net : 0.12 0.15 Mbits/s 1383
> TCP upload BE2 london.starlink.taht.net::tcp_cwnd : 17.33 11.00 1046
> TCP upload BE2 london.starlink.taht.net::tcp_delivery_rate : 0.12 0.11 1041
> TCP upload BE2 london.starlink.taht.net::tcp_pacing_rate : 0.38 0.26 1044
> TCP upload BE2 london.starlink.taht.net::tcp_rtt : 1166.74 991.48 1043
> TCP upload BE2 london.starlink.taht.net::tcp_rtt_var : 79.99 68.27 1043
> TCP upload BE3 singapore.starlink.taht.net : 0.07 0.13 Mbits/s 1383
> TCP upload BE3 singapore.starlink.taht.net::tcp_cwnd : 13.60 9.00 1042
> TCP upload BE3 singapore.starlink.taht.net::tcp_delivery_rate : 0.07 0.08 1013
> TCP upload BE3 singapore.starlink.taht.net::tcp_pacing_rate : 0.23 0.20 1031
> TCP upload BE3 singapore.starlink.taht.net::tcp_rtt : 1302.23 1129.07 967
> TCP upload BE3 singapore.starlink.taht.net::tcp_rtt_var : 113.67 98.84 967
> TCP upload BE4 fremont.starlink.taht.net : 0.11 0.20 Mbits/s 1383
> TCP upload BE4 fremont.starlink.taht.net::tcp_cwnd : 17.55 11.00 1038
> TCP upload BE4 fremont.starlink.taht.net::tcp_delivery_rate : 0.11 0.10 1035
> TCP upload BE4 fremont.starlink.taht.net::tcp_pacing_rate : 0.32 0.23 1036
> TCP upload BE4 fremont.starlink.taht.net::tcp_rtt : 1094.64 887.54 1033
> TCP upload BE4 fremont.starlink.taht.net::tcp_rtt_var : 67.20 59.16 1033
> TCP upload avg : 0.10 N/A Mbits/s 1383
> TCP upload fairness : 0.96 N/A Mbits/s 1383
> TCP upload sum : 0.42 N/A Mbits/s 1383
>
> ##########
> with smart queue (fq_codel) on the EdgeRouter
>
> flent -x --socket-stats --step-size=.05 -H de.starlink.taht.net -H london.starlink.taht.net -H singapore.starlink.taht.net -H fremont.starlink.taht.net -t fqcodel_erx_rttfair4be_8Mbpsdown_500Kbpsup_centurylinkdsl rtt_fair4be
> Started Flent 2.0.0 using Python 3.9.2.
> Starting rtt_fair4be test. Expected run time: 70 seconds.
> Data file written to ./rtt_fair4be-2022-04-17T150339.549817.fqcodel_erx_rttfair4be_8Mbpsdown_500Kbpsup_centurylinkdsl.flent.gz
>
> Summary of rtt_fair4be test run from 2022-04-17 14:03:39.549817
> Title: 'fqcodel_erx_rttfair4be_8Mbpsdown_500Kbpsup_centurylinkdsl'
>
> avg median # data pts
> Ping (ms) ICMP1 de.starlink.taht.net : 392.93 208.00 ms 1384
> Ping (ms) ICMP2 london.starlink.taht.net : 373.94 196.00 ms 1384
> Ping (ms) ICMP3 singapore.starlink.taht.net : 508.15 319.00 ms 1384
> Ping (ms) ICMP4 fremont.starlink.taht.net : 346.23 152.00 ms 1384
> Ping (ms) avg : 405.31 N/A ms 1384
> TCP download BE1 de.starlink.taht.net : 1.36 1.62 Mbits/s 1384
> TCP download BE2 london.starlink.taht.net : 1.47 1.63 Mbits/s 1384
> TCP download BE3 singapore.starlink.taht.net : 1.55 1.60 Mbits/s 1384
> TCP download BE4 fremont.starlink.taht.net : 1.50 1.80 Mbits/s 1384
> TCP download avg : 1.47 N/A Mbits/s 1384
> TCP download fairness : 1.00 N/A Mbits/s 1384
> TCP download sum : 5.88 N/A Mbits/s 1384
> TCP upload BE1 de.starlink.taht.net : 0.09 0.85 Mbits/s 1384
> TCP upload BE1 de.starlink.taht.net::tcp_cwnd : 4.50 4.00 1035
> TCP upload BE1 de.starlink.taht.net::tcp_delivery_rate : 0.08 0.08 1030
> TCP upload BE1 de.starlink.taht.net::tcp_pacing_rate : 0.17 0.15 1032
> TCP upload BE1 de.starlink.taht.net::tcp_rtt : 458.11 318.82 1027
> TCP upload BE1 de.starlink.taht.net::tcp_rtt_var : 95.76 61.88 1027
> TCP upload BE2 london.starlink.taht.net : 0.09 0.93 Mbits/s 1384
> TCP upload BE2 london.starlink.taht.net::tcp_cwnd : 4.17 4.00 1038
> TCP upload BE2 london.starlink.taht.net::tcp_delivery_rate : 0.08 0.08 1033
> TCP upload BE2 london.starlink.taht.net::tcp_pacing_rate : 0.17 0.14 1036
> TCP upload BE2 london.starlink.taht.net::tcp_rtt : 452.67 322.49 1033
> TCP upload BE2 london.starlink.taht.net::tcp_rtt_var : 96.87 64.28 1033
> TCP upload BE3 singapore.starlink.taht.net : 0.06 0.44 Mbits/s 1384
> TCP upload BE3 singapore.starlink.taht.net::tcp_cwnd : 4.16 4.00 1040
> TCP upload BE3 singapore.starlink.taht.net::tcp_delivery_rate : 0.06 0.06 1031
> TCP upload BE3 singapore.starlink.taht.net::tcp_pacing_rate : 0.12 0.11 1036
> TCP upload BE3 singapore.starlink.taht.net::tcp_rtt : 577.75 438.61 1027
> TCP upload BE3 singapore.starlink.taht.net::tcp_rtt_var : 107.05 72.97 1027
> TCP upload BE4 fremont.starlink.taht.net : 0.10 1.48 Mbits/s 1384
> TCP upload BE4 fremont.starlink.taht.net::tcp_cwnd : 4.45 4.00 1020
> TCP upload BE4 fremont.starlink.taht.net::tcp_delivery_rate : 0.09 0.09 1017
> TCP upload BE4 fremont.starlink.taht.net::tcp_pacing_rate : 0.21 0.16 1019
> TCP upload BE4 fremont.starlink.taht.net::tcp_rtt : 439.05 285.86 1018
> TCP upload BE4 fremont.starlink.taht.net::tcp_rtt_var : 81.90 56.33 1018
> TCP upload avg : 0.08 N/A Mbits/s 1384
> TCP upload fairness : 0.97 N/A Mbits/s 1384
> TCP upload sum : 0.34 N/A Mbits/s 1384
>
>
> EdgeRouter Settings
>
> smart-queue DSL {
> download {
> ecn enable
> flows 1024
> fq-quantum 300
> limit 10240
> rate 8mbit
> }
> upload {
> ecn enable
> flows 1024
> fq-quantum 300
> limit 10240
> rate 600kbit
> target 15ms
> }
> wan-interface pppoe0
>
> Also, here's the VMs qdisc settings. Which I now realize probably aren't the best
>
> sysctl -a | grep qdisc
> net.core.default_qdisc = pfifo_fast
>
> tc -s qdisc
> qdisc noqueue 0: dev lo root refcnt 2
> Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc mq 0: dev eth0 root
> Sent 628201 bytes 8643 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
> qdisc pfifo_fast 0: dev eth0 parent :1 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
> Sent 628201 bytes 8643 pkt (dropped 0, overlimits 0 requeues 0)
> backlog 0b 0p requeues 0
>
>
>
> -Jordan
>
> -----Original Message-----
> From: Starlink <starlink-bounces at lists.bufferbloat.net> On Behalf Of Dave Taht
> Sent: Saturday, April 16, 2022 9:40 PM
> To: flent-users <flent-users at flent.org>; bloat <bloat at lists.bufferbloat.net>; starlink at lists.bufferbloat.net
> Subject: [Starlink] an rtt_fair test?
>
> if anyone has a bit of spare time this holiday, I'd like to collect a few results from various networks around the web this week, not just on the turris. Example command line and outputs here:
>
> https://forum.turris.cz/t/sqm-on-turris-flent-benchmarks/17048/
>
> --
> I tried to build a better future, a few times:
> https://wayforward.archive.org/?site=https%3A%2F%2Fwww.icei.org
>
> Dave Täht CEO, TekLibre, LLC
> _______________________________________________
> Starlink mailing list
> Starlink at lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/starlink
>
--
I tried to build a better future, a few times:
https://wayforward.archive.org/?site=https%3A%2F%2Fwww.icei.org
Dave Täht CEO, TekLibre, LLC
More information about the Starlink
mailing list