[LibreQoS] [Starlink] [Rpm] the grinch meets cloudflare'schristmas present

Dick Roy dickroy at alum.mit.edu
Fri Jan 6 18:29:18 EST 2023


See below .

 

-----Original Message-----
From: Starlink [mailto:starlink-bounces at lists.bufferbloat.net] On Behalf Of
rjmcmahon via Starlink
Sent: Friday, January 6, 2023 12:39 PM
To: MORTON JR., AL
Cc: Dave Taht via Starlink; IETF IPPM WG; libreqos; Cake List; Rpm; bloat
Subject: Re: [Starlink] [Rpm] [LibreQoS] the grinch meets
cloudflare'schristmas present

 

Some thoughts are not to use UDP for testing here. Also, these speed 

tests have little to no information for network engineers about what's 

going on. Iperf 2 may better assist network engineers but then I'm 

biased ;)

 

Running iperf 2 https://sourceforge.net/projects/iperf2/ with 

--trip-times. Though the sampling and central limit theorem averaging is 

hiding the real distributions (use --histograms to get those)

[RR] FWIW (IMNBWM :-)). If the output/final histograms indicate the PDF is
NOT Gaussian, then any application of the CLT is
inappropriate/contra-indicated! The CLT is a "proof under certain regularity
conditions/assumptions of underlying/constituent PDFs, that the resulting
PDF (after all the necessary convolutions are performed to get to the PDF of
the output) will asymptotically approach a Gaussian with only a mean and a
std. dev. left to specify. 

 

Below are 4 parallel TCP streams from my home to one of my servers in 

the cloud. First where TCP is limited per CCA. Second is source side 

write rate limiting. Things to note:

 

o) connect times for both at 10-15 ms

o) multiple TCP retries on a few rites - one case is 4 with 5 writes. 

Source side pacing eliminates retries

o) Fairness with CCA isn't great but quite good with source side write 

pacing

o) Queue depth with CCA is about 150 Kbytes about 100K byte with source 

side pacing

o) min write to read is about 80 ms for both

o) max is 220 ms vs 97 ms

o) stdev for CCA write/read is 30 ms vs 3 ms

o) TCP RTT is 20ms w/CCA and 90 ms with ssp - seems odd here as 

TCP_QUICACK and TCP_NODELAY are both enabled.

 

[ CT] final connect times (min/avg/max/stdev) = 

10.326/13.522/14.986/2150.329 ms (tot/err) = 4/0

[rjmcmahon at ryzen3950 iperf2-code]$ iperf -c *** --hide-ips -e 

--trip-times -i 1 -P 4 -t 10 -w 4m --tcp-quickack -N

------------------------------------------------------------

Client connecting to (**hidden**), TCP port 5001 with pid 107678 (4 

flows)

Write buffer size: 131072 Byte

TOS set to 0x0 and nodelay (Nagle off)

TCP window size: 7.63 MByte (WARNING: requested 3.81 MByte)

Event based writes (pending queue watermark at 16384 bytes)

------------------------------------------------------------

[  1] local *.*.*.85%enp4s0 port 42480 connected with *.*.*.123 port 

5001 (prefetch=16384) (trip-times) (sock=3) (qack) 

(icwnd/mss/irtt=14/1448/10534) (ct=10.63 ms) on 2023-01-06 12:17:56 

(PST)

[  4] local *.*.*.85%enp4s0 port 42488 connected with *.*.*.123 port 

5001 (prefetch=16384) (trip-times) (sock=5) (qack) 

(icwnd/mss/irtt=14/1448/14023) (ct=14.08 ms) on 2023-01-06 12:17:56 

(PST)

[  3] local *.*.*.85%enp4s0 port 42502 connected with *.*.*.123 port 

5001 (prefetch=16384) (trip-times) (sock=6) (qack) 

(icwnd/mss/irtt=14/1448/14642) (ct=14.70 ms) on 2023-01-06 12:17:56 

(PST)

[  2] local *.*.*.85%enp4s0 port 42484 connected with *.*.*.123 port 

5001 (prefetch=16384) (trip-times) (sock=4) (qack) 

(icwnd/mss/irtt=14/1448/14728) (ct=14.79 ms) on 2023-01-06 12:17:56 

(PST)

[ ID] Interval        Transfer    Bandwidth       Write/Err  Rtry     

Cwnd/RTT(var)        NetPwr

...

[  4] 4.00-5.00 sec  1.38 MBytes  11.5 Mbits/sec  11/0         3       

29K/21088(1142) us  68.37

[  2] 4.00-5.00 sec  1.62 MBytes  13.6 Mbits/sec  13/0         2       

31K/19284(612) us  88.36

[  1] 4.00-5.00 sec   896 KBytes  7.34 Mbits/sec  7/0         5       

16K/18996(658) us  48.30

[  3] 4.00-5.00 sec  1.00 MBytes  8.39 Mbits/sec  8/0         5       

18K/18133(208) us  57.83

[SUM] 4.00-5.00 sec  4.88 MBytes  40.9 Mbits/sec  39/0        15

[  4] 5.00-6.00 sec  1.25 MBytes  10.5 Mbits/sec  10/0         4       

29K/14717(489) us  89.06

[  1] 5.00-6.00 sec  1.00 MBytes  8.39 Mbits/sec  8/0         4       

16K/15874(408) us  66.06

[  3] 5.00-6.00 sec  1.12 MBytes  9.44 Mbits/sec  9/0         4       

16K/15826(382) us  74.54

[  2] 5.00-6.00 sec  1.50 MBytes  12.6 Mbits/sec  12/0         6        

9K/14878(557) us  106

[SUM] 5.00-6.00 sec  4.88 MBytes  40.9 Mbits/sec  39/0        18

[  4] 6.00-7.00 sec  1.75 MBytes  14.7 Mbits/sec  14/0         4       

25K/15472(496) us  119

[  2] 6.00-7.00 sec  1.00 MBytes  8.39 Mbits/sec  8/0         2       

26K/16417(427) us  63.87

[  1] 6.00-7.00 sec  1.25 MBytes  10.5 Mbits/sec  10/0         5       

16K/16268(679) us  80.57

[  3] 6.00-7.00 sec  1.00 MBytes  8.39 Mbits/sec  8/0         6       

15K/16629(799) us  63.06

[SUM] 6.00-7.00 sec  5.00 MBytes  41.9 Mbits/sec  40/0        17

[  4] 7.00-8.00 sec  1.75 MBytes  14.7 Mbits/sec  14/0         4       

22K/13986(519) us  131

[  1] 7.00-8.00 sec  1.12 MBytes  9.44 Mbits/sec  9/0         4       

16K/12679(377) us  93.04

[  3] 7.00-8.00 sec   896 KBytes  7.34 Mbits/sec  7/0         5       

14K/12971(367) us  70.74

[  2] 7.00-8.00 sec  1.12 MBytes  9.44 Mbits/sec  9/0         6       

15K/14740(779) us  80.03

[SUM] 7.00-8.00 sec  4.88 MBytes  40.9 Mbits/sec  39/0        19

 

[root at bobcat iperf2-code]# iperf -s -i 1 -e --hide-ips -w 4m

------------------------------------------------------------

Server listening on TCP port 5001 with pid 233615

Read buffer size:  128 KByte (Dist bin width=16.0 KByte)

TCP window size: 7.63 MByte (WARNING: requested 3.81 MByte)

------------------------------------------------------------

[  1] local *.*.*.123%eth0 port 5001 connected with *.*.*.171 port 42480 

(trip-times) (sock=4) (peer 2.1.9-master) (qack) 

(icwnd/mss/irtt=14/1448/11636) on 2023-01-06 12:17:56 (PST)

[  2] local *.*.*.123%eth0 port 5001 connected with *.*.*.171 port 42502 

(trip-times) (sock=5) (peer 2.1.9-master) (qack) 

(icwnd/mss/irtt=14/1448/11898) on 2023-01-06 12:17:56 (PST)

[  3] local *.*.*.123%eth0 port 5001 connected with *.*.*.171 port 42484 

(trip-times) (sock=6) (peer 2.1.9-master) (qack) 

(icwnd/mss/irtt=14/1448/11938) on 2023-01-06 12:17:56 (PST)

[  4] local *.*.*.123%eth0 port 5001 connected with *.*.*.171 port 42488 

(trip-times) (sock=7) (peer 2.1.9-master) (qack) 

(icwnd/mss/irtt=14/1448/11919) on 2023-01-06 12:17:56 (PST)

[ ID] Interval        Transfer    Bandwidth    Burst Latency 

avg/min/max/stdev (cnt/size) inP NetPwr  Reads=Dist

...

[  2] 4.00-5.00 sec  1.06 MBytes  8.86 Mbits/sec  

129.819/90.391/186.075/31.346 ms (9/123080)  154 KByte 8.532803  

467=461:6:0:0:0:0:0:0

[  3] 4.00-5.00 sec  1.52 MBytes  12.8 Mbits/sec  

103.552/82.653/169.274/28.382 ms (12/132854)  149 KByte 15.40  

646=643:1:2:0:0:0:0:0

[  4] 4.00-5.00 sec  1.39 MBytes  11.6 Mbits/sec  

107.503/66.843/143.038/24.269 ms (11/132294)  149 KByte 13.54  

619=617:1:1:0:0:0:0:0

[  1] 4.00-5.00 sec   988 KBytes  8.10 Mbits/sec  

141.389/119.961/178.785/18.812 ms (7/144593)  170 KByte 7.158641  

409=404:5:0:0:0:0:0:0

[SUM] 4.00-5.00 sec  4.93 MBytes  41.4 Mbits/sec  

2141=2125:13:3:0:0:0:0:0

[  4] 5.00-6.00 sec  1.29 MBytes  10.8 Mbits/sec  

118.943/86.253/176.128/31.248 ms (10/135098)  164 KByte 11.36  

511=506:2:3:0:0:0:0:0

[  2] 5.00-6.00 sec  1.09 MBytes  9.17 Mbits/sec  

139.821/102.418/218.875/40.422 ms (9/127424)  148 KByte 8.202049  

487=484:2:1:0:0:0:0:0

[  3] 5.00-6.00 sec  1.51 MBytes  12.6 Mbits/sec  

102.146/77.085/140.893/18.441 ms (13/121520)  151 KByte 15.47  

640=636:1:3:0:0:0:0:0

[  1] 5.00-6.00 sec   981 KBytes  8.04 Mbits/sec  

161.901/105.582/219.931/36.260 ms (8/125614)  134 KByte 6.206944  

415=413:2:0:0:0:0:0:0

[SUM] 5.00-6.00 sec  4.85 MBytes  40.7 Mbits/sec  

2053=2039:7:7:0:0:0:0:0

[  4] 6.00-7.00 sec  1.74 MBytes  14.6 Mbits/sec  

88.846/74.297/101.859/7.118 ms (14/130526)  156 KByte 20.57  

711=707:3:1:0:0:0:0:0

[  1] 6.00-7.00 sec  1.22 MBytes  10.2 Mbits/sec  

120.639/100.257/157.567/21.770 ms (10/127568)  157 KByte 10.57  

494=488:5:1:0:0:0:0:0

[  2] 6.00-7.00 sec  1015 KBytes  8.32 Mbits/sec  

144.632/124.368/171.349/16.597 ms (8/129958)  143 KByte 7.188321  

408=403:5:0:0:0:0:0:0

[  3] 6.00-7.00 sec  1.02 MBytes  8.60 Mbits/sec  

143.516/102.322/173.001/24.089 ms (8/134302)  146 KByte 7.486359  

484=480:4:0:0:0:0:0:0

[SUM] 6.00-7.00 sec  4.98 MBytes  41.7 Mbits/sec  

2097=2078:17:2:0:0:0:0:0

[  4] 7.00-8.00 sec  1.77 MBytes  14.9 Mbits/sec  

85.406/65.797/103.418/12.609 ms (14/132595)  153 KByte 21.74  

692=687:2:3:0:0:0:0:0

[  2] 7.00-8.00 sec   957 KBytes  7.84 Mbits/sec  

153.936/131.452/191.464/19.361 ms (7/140042)  160 KByte 6.368199  

429=425:4:0:0:0:0:0:0

[  1] 7.00-8.00 sec  1.13 MBytes  9.44 Mbits/sec  

131.146/109.737/166.774/22.035 ms (9/131124)  146 KByte 8.998528  

520=516:4:0:0:0:0:0:0

[  3] 7.00-8.00 sec  1.13 MBytes  9.51 Mbits/sec  

126.512/88.404/220.175/42.237 ms (9/132089)  172 KByte 9.396784  

527=524:1:2:0:0:0:0:0

[SUM] 7.00-8.00 sec  4.96 MBytes  41.6 Mbits/sec  

2168=2152:11:5:0:0:0:0:0

 

With source side rate limiting to 9 mb/s per stream.

 

[rjmcmahon at ryzen3950 iperf2-code]$ iperf -c *** --hide-ips -e 

--trip-times -i 1 -P 4 -t 10 -w 4m --tcp-quickack -N -b 9m

------------------------------------------------------------

Client connecting to (**hidden**), TCP port 5001 with pid 108884 (4 

flows)

Write buffer size: 131072 Byte

TOS set to 0x0 and nodelay (Nagle off)

TCP window size: 7.63 MByte (WARNING: requested 3.81 MByte)

Event based writes (pending queue watermark at 16384 bytes)

------------------------------------------------------------

[  1] local *.*.*.85%enp4s0 port 46448 connected with *.*.*.123 port 

5001 (prefetch=16384) (trip-times) (sock=3) (qack) 

(icwnd/mss/irtt=14/1448/10666) (ct=10.70 ms) on 2023-01-06 12:27:45 

(PST)

[  3] local *.*.*.85%enp4s0 port 46460 connected with *.*.*.123 port 

5001 (prefetch=16384) (trip-times) (sock=6) (qack) 

(icwnd/mss/irtt=14/1448/16499) (ct=16.54 ms) on 2023-01-06 12:27:45 

(PST)

[  2] local *.*.*.85%enp4s0 port 46454 connected with *.*.*.123 port 

5001 (prefetch=16384) (trip-times) (sock=4) (qack) 

(icwnd/mss/irtt=14/1448/16580) (ct=16.86 ms) on 2023-01-06 12:27:45 

(PST)

[  4] local *.*.*.85%enp4s0 port 46458 connected with *.*.*.123 port 

5001 (prefetch=16384) (trip-times) (sock=5) (qack) 

(icwnd/mss/irtt=14/1448/16802) (ct=16.83 ms) on 2023-01-06 12:27:45 

(PST)

[ ID] Interval        Transfer    Bandwidth       Write/Err  Rtry     

Cwnd/RTT(var)        NetPwr

...

[  2] 4.00-5.00 sec  1.00 MBytes  8.39 Mbits/sec  8/0         0      

134K/88055(12329) us  11.91

[  4] 4.00-5.00 sec  1.00 MBytes  8.39 Mbits/sec  8/0         0      

132K/74867(11755) us  14.01

[  1] 4.00-5.00 sec  1.00 MBytes  8.39 Mbits/sec  8/0         0      

134K/89101(13134) us  11.77

[  3] 4.00-5.00 sec  1.00 MBytes  8.39 Mbits/sec  8/0         0      

131K/91451(11938) us  11.47

[SUM] 4.00-5.00 sec  4.00 MBytes  33.6 Mbits/sec  32/0         0

[  2] 5.00-6.00 sec  1.12 MBytes  9.44 Mbits/sec  9/0         0      

134K/85135(14580) us  13.86

[  4] 5.00-6.00 sec  1.12 MBytes  9.44 Mbits/sec  9/0         0      

132K/85124(15654) us  13.86

[  1] 5.00-6.00 sec  1.12 MBytes  9.44 Mbits/sec  9/0         0      

134K/91336(11335) us  12.92

[  3] 5.00-6.00 sec  1.12 MBytes  9.44 Mbits/sec  9/0         0      

131K/89185(13499) us  13.23

[SUM] 5.00-6.00 sec  4.50 MBytes  37.7 Mbits/sec  36/0         0

[  2] 6.00-7.00 sec  1.12 MBytes  9.44 Mbits/sec  9/0         0      

134K/85687(13489) us  13.77

[  4] 6.00-7.00 sec  1.12 MBytes  9.44 Mbits/sec  9/0         0      

132K/82803(13001) us  14.25

[  1] 6.00-7.00 sec  1.12 MBytes  9.44 Mbits/sec  9/0         0      

134K/86869(15186) us  13.58

[  3] 6.00-7.00 sec  1.12 MBytes  9.44 Mbits/sec  9/0         0      

131K/91447(12515) us  12.90

[SUM] 6.00-7.00 sec  4.50 MBytes  37.7 Mbits/sec  36/0         0

[  2] 7.00-8.00 sec  1.00 MBytes  8.39 Mbits/sec  8/0         0      

134K/81814(13168) us  12.82

[  4] 7.00-8.00 sec  1.00 MBytes  8.39 Mbits/sec  8/0         0      

132K/89008(13283) us  11.78

[  1] 7.00-8.00 sec  1.00 MBytes  8.39 Mbits/sec  8/0         0      

134K/89494(12151) us  11.72

[  3] 7.00-8.00 sec  1.00 MBytes  8.39 Mbits/sec  8/0         0      

131K/91083(12797) us  11.51

[SUM] 7.00-8.00 sec  4.00 MBytes  33.6 Mbits/sec  32/0         0

 

[root at bobcat iperf2-code]# iperf -s -i 1 -e --hide-ips -w 4m

------------------------------------------------------------

Server listening on TCP port 5001 with pid 233981

Read buffer size:  128 KByte (Dist bin width=16.0 KByte)

TCP window size: 7.63 MByte (WARNING: requested 3.81 MByte)

------------------------------------------------------------

[  1] local *.*.*.123%eth0 port 5001 connected with *.*.*.171 port 46448 

(trip-times) (sock=4) (peer 2.1.9-master) (qack) 

(icwnd/mss/irtt=14/1448/11987) on 2023-01-06 12:27:45 (PST)

[  2] local *.*.*.123%eth0 port 5001 connected with *.*.*.171 port 46454 

(trip-times) (sock=5) (peer 2.1.9-master) (qack) 

(icwnd/mss/irtt=14/1448/11132) on 2023-01-06 12:27:45 (PST)

[  3] local *.*.*.123%eth0 port 5001 connected with *.*.*.171 port 46460 

(trip-times) (sock=6) (peer 2.1.9-master) (qack) 

(icwnd/mss/irtt=14/1448/11097) on 2023-01-06 12:27:45 (PST)

[  4] local *.*.*.123%eth0 port 5001 connected with *.*.*.171 port 46458 

(trip-times) (sock=7) (peer 2.1.9-master) (qack) 

(icwnd/mss/irtt=14/1448/17823) on 2023-01-06 12:27:45 (PST)

[ ID] Interval        Transfer    Bandwidth    Burst Latency 

avg/min/max/stdev (cnt/size) inP NetPwr  Reads=Dist

[  4] 0.00-1.00 sec  1.09 MBytes  9.15 Mbits/sec  

93.383/90.103/95.661/2.232 ms (8/143028)  128 KByte 12.25  

451=451:0:0:0:0:0:0:0

[  3] 0.00-1.00 sec  1.08 MBytes  9.06 Mbits/sec  

96.834/95.229/102.645/2.442 ms (8/141580)  131 KByte 11.70  

472=472:0:0:0:0:0:0:0

[  1] 0.00-1.00 sec  1.10 MBytes  9.19 Mbits/sec  

95.183/92.623/97.579/1.431 ms (8/143571)  131 KByte 12.07  

495=495:0:0:0:0:0:0:0

[  2] 0.00-1.00 sec  1.09 MBytes  9.15 Mbits/sec  

89.317/84.865/94.906/3.674 ms (8/143028)  122 KByte 12.81  

489=489:0:0:0:0:0:0:0

[ ID] Interval        Transfer    Bandwidth       Reads=Dist

[SUM] 0.00-1.00 sec  4.36 MBytes  36.6 Mbits/sec  

1907=1907:0:0:0:0:0:0:0

[  4] 1.00-2.00 sec  1.07 MBytes  8.95 Mbits/sec  

92.649/89.987/95.036/1.828 ms (9/124314) 96.5 KByte 12.08  

492=492:0:0:0:0:0:0:0

[  3] 1.00-2.00 sec  1.06 MBytes  8.93 Mbits/sec  

96.305/95.647/96.794/0.432 ms (9/123992)  100 KByte 11.59  

480=480:0:0:0:0:0:0:0

[  1] 1.00-2.00 sec  1.06 MBytes  8.89 Mbits/sec  

92.578/90.866/94.145/1.371 ms (9/123510) 95.8 KByte 12.01  

513=513:0:0:0:0:0:0:0

[  2] 1.00-2.00 sec  1.07 MBytes  8.96 Mbits/sec  

90.767/87.984/94.352/1.944 ms (9/124475) 94.7 KByte 12.34  

489=489:0:0:0:0:0:0:0

[SUM] 1.00-2.00 sec  4.26 MBytes  35.7 Mbits/sec  

1974=1974:0:0:0:0:0:0:0

[  4] 2.00-3.00 sec  1.09 MBytes  9.13 Mbits/sec  

93.977/91.795/96.561/1.693 ms (8/142656)  112 KByte 12.14  

497=497:0:0:0:0:0:0:0

[  3] 2.00-3.00 sec  1.08 MBytes  9.04 Mbits/sec  

96.544/95.815/97.798/0.693 ms (8/141208)  114 KByte 11.70  

503=503:0:0:0:0:0:0:0

[  1] 2.00-3.00 sec  1.07 MBytes  9.01 Mbits/sec  

93.970/91.193/96.325/1.796 ms (8/140846)  111 KByte 11.99  

509=509:0:0:0:0:0:0:0

[  2] 2.00-3.00 sec  1.08 MBytes  9.10 Mbits/sec  

92.843/90.216/96.355/2.040 ms (8/142113)  111 KByte 12.25  

509=509:0:0:0:0:0:0:0

[SUM] 2.00-3.00 sec  4.32 MBytes  36.3 Mbits/sec  

2018=2018:0:0:0:0:0:0:0

[  4] 3.00-4.00 sec  1.06 MBytes  8.86 Mbits/sec  

93.222/89.063/96.104/2.346 ms (9/123027) 96.1 KByte 11.88  

487=487:0:0:0:0:0:0:0

[  3] 3.00-4.00 sec  1.07 MBytes  8.97 Mbits/sec  

96.277/95.051/97.230/0.767 ms (9/124636)  101 KByte 11.65  

489=489:0:0:0:0:0:0:0

[  1] 3.00-4.00 sec  1.08 MBytes  9.02 Mbits/sec  

93.899/88.732/96.972/2.737 ms (9/125280) 98.6 KByte 12.01  

493=493:0:0:0:0:0:0:0

[  2] 3.00-4.00 sec  1.07 MBytes  8.97 Mbits/sec  

92.490/89.862/95.265/1.796 ms (9/124636) 96.6 KByte 12.13  

493=493:0:0:0:0:0:0:0

[SUM] 3.00-4.00 sec  4.27 MBytes  35.8 Mbits/sec  

1962=1962:0:0:0:0:0:0:0

[  4] 4.00-5.00 sec  1.07 MBytes  9.00 Mbits/sec  

92.431/81.888/96.221/4.524 ms (9/124958) 96.8 KByte 12.17  

498=498:0:0:0:0:0:0:0

[  1] 4.00-5.00 sec  1.07 MBytes  8.97 Mbits/sec  

95.018/93.445/96.200/0.957 ms (9/124636) 99.3 KByte 11.81  

490=490:0:0:0:0:0:0:0

[  2] 4.00-5.00 sec  1.06 MBytes  8.90 Mbits/sec  

93.874/86.485/95.672/2.810 ms (9/123671) 97.3 KByte 11.86  

481=481:0:0:0:0:0:0:0

[  3] 4.00-5.00 sec  1.08 MBytes  9.09 Mbits/sec  

95.737/93.881/97.197/0.972 ms (9/126245)  101 KByte 11.87  

484=484:0:0:0:0:0:0:0

[SUM] 4.00-5.00 sec  4.29 MBytes  36.0 Mbits/sec  

1953=1953:0:0:0:0:0:0:0

[  4] 5.00-6.00 sec  1.09 MBytes  9.13 Mbits/sec  

92.908/86.844/95.994/3.012 ms (8/142656)  111 KByte 12.28  

467=467:0:0:0:0:0:0:0

[  3] 5.00-6.00 sec  1.07 MBytes  8.94 Mbits/sec  

96.593/95.343/97.660/0.876 ms (8/139760)  113 KByte 11.58  

478=478:0:0:0:0:0:0:0

[  1] 5.00-6.00 sec  1.08 MBytes  9.03 Mbits/sec  

95.021/91.421/97.167/1.893 ms (8/141027)  112 KByte 11.87  

491=491:0:0:0:0:0:0:0

[  2] 5.00-6.00 sec  1.08 MBytes  9.06 Mbits/sec  

92.162/82.720/97.692/5.060 ms (8/141570)  109 KByte 12.29  

488=488:0:0:0:0:0:0:0

[SUM] 5.00-6.00 sec  4.31 MBytes  36.2 Mbits/sec  

1924=1924:0:0:0:0:0:0:0

[  4] 6.00-7.00 sec  1.04 MBytes  8.70 Mbits/sec  

92.793/85.343/96.967/3.552 ms (9/120775) 93.9 KByte 11.71  

485=485:0:0:0:0:0:0:0

[  2] 6.00-7.00 sec  1.05 MBytes  8.79 Mbits/sec  

91.679/84.479/96.760/3.975 ms (9/122062) 93.8 KByte 11.98  

472=472:0:0:0:0:0:0:0

[  3] 6.00-7.00 sec  1.06 MBytes  8.88 Mbits/sec  

96.982/95.933/98.371/0.680 ms (9/123349)  100 KByte 11.45  

477=477:0:0:0:0:0:0:0

[  1] 6.00-7.00 sec  1.05 MBytes  8.80 Mbits/sec  

94.342/91.660/96.025/1.660 ms (9/122223) 96.7 KByte 11.66  

494=494:0:0:0:0:0:0:0

[SUM] 6.00-7.00 sec  4.19 MBytes  35.2 Mbits/sec  

1928=1928:0:0:0:0:0:0:0

[  4] 7.00-8.00 sec  1.10 MBytes  9.25 Mbits/sec  

92.515/88.182/96.351/2.538 ms (8/144466)  112 KByte 12.49  

510=510:0:0:0:0:0:0:0

[  3] 7.00-8.00 sec  1.09 MBytes  9.13 Mbits/sec  

96.580/95.737/98.977/1.098 ms (8/142656)  115 KByte 11.82  

480=480:0:0:0:0:0:0:0

[  1] 7.00-8.00 sec  1.10 MBytes  9.21 Mbits/sec  

95.269/91.719/97.514/2.126 ms (8/143923)  115 KByte 12.09  

515=515:0:0:0:0:0:0:0

[  2] 7.00-8.00 sec  1.11 MBytes  9.29 Mbits/sec  

90.073/84.700/96.176/4.324 ms (8/145190)  110 KByte 12.90  

508=508:0:0:0:0:0:0:0

[SUM] 7.00-8.00 sec  4.40 MBytes  36.9 Mbits/sec  

2013=2013:0:0:0:0:0:0:0

 

Bob

 

>> -----Original Message-----

> 

>> From: LibreQoS <libreqos-bounces at lists.bufferbloat.net> On Behalf Of

> Dave Taht

> 

>> via LibreQoS

> 

>> Sent: Wednesday, January 4, 2023 12:26 PM

> 

>> Subject: [LibreQoS] the grinch meets cloudflare's christmas present

> 

>> 

> 

>> Please try the new, the shiny, the really wonderful test here:

> 

>> 

>
https://urldefense.com/v3/__https://speed.cloudflare.com/__;!!BhdT!iZcFJ8WVU
9S

> [1]

> 

>> 

>
9zz5t456oxkfObrC5Xb9j5AG8UO3DqD5x4GAJkawZr0iGwEUtF0_09U8mCDnAkrJ9QEMHGbCMKVw
$

> [1]

> 

>> 

> 

>> I would really appreciate some independent verification of

> 

>> measurements using this tool. In my brief experiments it appears -

> as

> 

>> all the commercial tools to date - to dramatically understate the

> 

>> bufferbloat, on my LTE, (and my starlink terminal is out being

> 

>> hacked^H^H^H^H^H^Hworked on, so I can't measure that)

> 

> [acm]

> 

> Hi Dave, I made some time to test "cloudflare's christmas present"

> yesterday.

> 

> I'm on DOCSIS 3.1 service with 1Gbps Down. The Upstream has a "turbo"

> mode with 40-50Mbps for the first ~3 sec, then steady-state about

> 23Mbps.

> 

> When I saw the ~620Mbps Downstream measurement, I was ready to

> complain that even the IP-Layer Capacity was grossly underestimated.

> In addition, the Latency measurements seem very low (as you asserted),

> although the cloud server was "nearby".

> 

> However, I found that Ookla and the ISP-provided measurement were also

> reporting ~600Mbps! So the cloudflare Downstream capacity (or

> throughput?) measurement was consistent with others. Our UDPST server

> was unreachable, otherwise I would have added that measurement, too.

> 

> The Upstream measurement graph seems to illustrate the "turbo"

> mode, with the dip after attaining 44.5Mbps.

> 

> UDPST saturates the uplink and we measure the full 250ms of the

> Upstream buffer. Cloudflare's latency measurements don't even come

> close.

> 

> Al

> 

> 

> 

> Links:

> ------

> [1] 

>
https://urldefense.com/v3/__https:/speed.cloudflare.com/__;!!BhdT!iZcFJ8WVU9
S9zz5t456oxkfObrC5Xb9j5AG8UO3DqD5x4GAJkawZr0iGwEUtF0_09U8mCDnAkrJ9QEMHGbCMKV
w$

> _______________________________________________

> Rpm mailing list

> Rpm at lists.bufferbloat.net

> https://lists.bufferbloat.net/listinfo/rpm

_______________________________________________

Starlink mailing list

Starlink at lists.bufferbloat.net

https://lists.bufferbloat.net/listinfo/starlink

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.bufferbloat.net/pipermail/libreqos/attachments/20230106/2a50d895/attachment-0001.html>


More information about the LibreQoS mailing list