[Starlink] [Rpm] [LibreQoS] the grinch meets cloudflare's christmas present

rjmcmahon rjmcmahon at rjmcmahon.com
Fri Jan 6 15:47:40 EST 2023


For responsiveness, the bounceback seems reasonable even with upstream 
competition. Bunch more TCP retries though.

[rjmcmahon at ryzen3950 iperf2-code]$ iperf -c *** --hide-ips -e 
--trip-times -i 1 --bounceback -t 3
------------------------------------------------------------
Client connecting to (**hidden**), TCP port 5001 with pid 111022 (1 
flows)
Write buffer size:  100 Byte
Bursting:  100 Byte writes 10 times every 1.00 second(s)
Bounce-back test (size= 100 Byte) (server hold req=0 usecs & 
tcp_quickack)
TOS set to 0x0 and nodelay (Nagle off)
TCP window size: 16.0 KByte (default)
Event based writes (pending queue watermark at 16384 bytes)
------------------------------------------------------------
[  1] local *.*.*.86%enp7s0 port 36976 connected with *.*.*.123 port 
5001 (prefetch=16384) (bb w/quickack len/hold=100/0) (trip-times) 
(sock=3) (icwnd/mss/irtt=14/1448/9862) (ct=9.90 ms) on 2023-01-06 
12:42:18 (PST)
[ ID] Interval        Transfer    Bandwidth         BB 
cnt=avg/min/max/stdev         Rtry  Cwnd/RTT    RPS
[  1] 0.00-1.00 sec  1.95 KBytes  16.0 Kbits/sec    
10=12.195/9.298/16.457/2.679 ms    0   14K/11327 us    82 rps
[  1] 1.00-2.00 sec  1.95 KBytes  16.0 Kbits/sec    
10=12.613/9.271/15.489/2.788 ms    0   14K/12165 us    79 rps
[  1] 2.00-3.00 sec  1.95 KBytes  16.0 Kbits/sec    
10=13.390/9.376/15.986/2.520 ms    0   14K/13164 us    75 rps
[  1] 0.00-3.03 sec  5.86 KBytes  15.8 Kbits/sec    
30=12.733/9.271/16.457/2.620 ms    0   14K/15138 us    79 rps
[  1] 0.00-3.03 sec  OWD Delays (ms) Cnt=30 To=7.937/4.634/11.327/2.457 
 From=4.778/4.401/5.350/0.258 Asymmetry=3.166/0.097/6.311/2.318    79 rps
[  1] 0.00-3.03 sec BB8(f)-PDF: 
bin(w=100us):cnt(30)=93:2,94:3,95:2,97:1,100:1,102:1,105:1,114:2,142:1,143:1,144:2,145:3,146:1,147:1,148:1,151:1,152:1,154:1,155:1,156:1,160:1,165:1 
(5.00/95.00/99.7%=93/160/165,Outliers=0,obl/obu=0/0)

[rjmcmahon at ryzen3950 iperf2-code]$ iperf -c *** --hide-ips -e 
--trip-times -i 1 --bounceback -t 3 --bounceback-congest=up,4
------------------------------------------------------------
Client connecting to (**hidden**), TCP port 5001 with pid 111069 (1 
flows)
Write buffer size:  100 Byte
Bursting:  100 Byte writes 10 times every 1.00 second(s)
Bounce-back test (size= 100 Byte) (server hold req=0 usecs & 
tcp_quickack)
TOS set to 0x0 and nodelay (Nagle off)
TCP window size: 16.0 KByte (default)
Event based writes (pending queue watermark at 16384 bytes)
------------------------------------------------------------
[  2] local *.*.*.85%enp4s0 port 38342 connected with *.*.*.123 port 
5001 (prefetch=16384) (trip-times) (sock=3) (qack) 
(icwnd/mss/irtt=14/1448/10613) (ct=10.66 ms) on 2023-01-06 12:42:36 
(PST)
[  1] local *.*.*.85%enp4s0 port 38360 connected with *.*.*.123 port 
5001 (prefetch=16384) (bb w/quickack len/hold=100/0) (trip-times) 
(sock=4) (icwnd/mss/irtt=14/1448/14901) (ct=14.96 ms) on 2023-01-06 
12:42:36 (PST)
[  3] local *.*.*.85%enp4s0 port 38386 connected with *.*.*.123 port 
5001 (prefetch=16384) (trip-times) (sock=7) (qack) 
(icwnd/mss/irtt=14/1448/15295) (ct=15.31 ms) on 2023-01-06 12:42:36 
(PST)
[  4] local *.*.*.85%enp4s0 port 38348 connected with *.*.*.123 port 
5001 (prefetch=16384) (trip-times) (sock=5) (qack) 
(icwnd/mss/irtt=14/1448/14901) (ct=14.95 ms) on 2023-01-06 12:42:36 
(PST)
[  5] local *.*.*.85%enp4s0 port 38372 connected with *.*.*.123 port 
5001 (prefetch=16384) (trip-times) (sock=6) (qack) 
(icwnd/mss/irtt=14/1448/15371) (ct=15.42 ms) on 2023-01-06 12:42:36 
(PST)
[ ID] Interval        Transfer    Bandwidth       Write/Err  Rtry     
Cwnd/RTT(var)        NetPwr
[  3] 0.00-1.00 sec  1.29 MBytes  10.8 Mbits/sec  13502/0       115      
  28K/22594(904) us  59.76
[  4] 0.00-1.00 sec  1.63 MBytes  13.6 Mbits/sec  17048/0       140      
  42K/22728(568) us  75.01
[ ID] Interval        Transfer    Bandwidth         BB 
cnt=avg/min/max/stdev         Rtry  Cwnd/RTT    RPS
[  1] 0.00-1.00 sec  1.95 KBytes  16.0 Kbits/sec    
10=76.140/17.224/123.195/43.168 ms    0   14K/68136 us    13 rps
[  5] 0.00-1.00 sec  1.04 MBytes  8.72 Mbits/sec  10893/0        82      
  25K/23400(644) us  46.55
[SUM] 0.00-1.00 sec  3.95 MBytes  33.2 Mbits/sec  41443/0       337
[  2] 0.00-1.00 sec  1.10 MBytes  9.25 Mbits/sec  11566/0        77      
  22K/23557(432) us  49.10
[  3] 1.00-2.00 sec  1.24 MBytes  10.4 Mbits/sec  13037/0        20      
  28K/14427(503) us  90.37
[  4] 1.00-2.00 sec  1.43 MBytes  12.0 Mbits/sec  14954/0        31      
  12K/13348(407) us  112
[  1] 1.00-2.00 sec  1.95 KBytes  16.0 Kbits/sec    
10=14.581/10.801/20.356/3.599 ms    0   14K/27791 us    69 rps
[  5] 1.00-2.00 sec  1.26 MBytes  10.6 Mbits/sec  13191/0        16      
  12K/14749(675) us  89.44
[SUM] 1.00-2.00 sec  3.93 MBytes  32.9 Mbits/sec  41182/0        67
[  2] 1.00-2.00 sec  1000 KBytes  8.19 Mbits/sec  10237/0        13      
  19K/14467(1068) us  70.76
[  3] 2.00-3.00 sec  1.33 MBytes  11.2 Mbits/sec  13994/0         4      
  24K/20749(495) us  67.44
[  4] 2.00-3.00 sec  1.20 MBytes  10.1 Mbits/sec  12615/0         3      
  31K/20877(718) us  60.43
[  1] 2.00-3.00 sec  1.95 KBytes  16.0 Kbits/sec    
10=11.298/9.407/14.245/1.330 ms    0   14K/15474 us    89 rps
[  5] 2.00-3.00 sec  1.08 MBytes  9.03 Mbits/sec  11284/0         3      
  28K/21031(430) us  53.65
[SUM] 2.00-3.00 sec  3.61 MBytes  30.3 Mbits/sec  37893/0        10
[  2] 2.00-3.00 sec  1.29 MBytes  10.8 Mbits/sec  13492/0         3      
  29K/20409(688) us  66.11
[  3] 0.00-3.03 sec  3.87 MBytes  10.7 Mbits/sec  40534/0       139      
  25K/20645(557) us  64.85
[  5] 0.00-3.03 sec  3.37 MBytes  9.35 Mbits/sec  35369/0       101      
  29K/20489(668) us  57.02
[  4] 0.00-3.03 sec  4.26 MBytes  11.8 Mbits/sec  44618/0       174      
  32K/21240(961) us  69.40
[  2] 0.00-3.03 sec  3.37 MBytes  9.31 Mbits/sec  35296/0        94      
  19K/21504(948) us  54.13
[  1] 0.00-3.14 sec  7.81 KBytes  20.4 Kbits/sec    
40=28.332/5.611/123.195/34.940 ms    0   14K/14000 us    35 rps
[  1] 0.00-3.14 sec  OWD Delays (ms) Cnt=40 
To=23.730/1.110/118.744/34.957 From=4.567/4.356/5.171/0.141 
Asymmetry=19.332/0.189/114.294/34.869    35 rps
[  1] 0.00-3.14 sec BB8(f)-PDF: 
bin(w=100us):cnt(40)=57:1,94:2,95:2,96:2,98:1,101:1,106:1,109:2,111:1,112:2,113:1,115:1,118:1,119:2,143:2,145:1,146:1,152:1,158:1,173:1,176:1,194:1,195:1,204:1,205:1,274:1,554:1,790:1,925:1,1125:1,1126:1,1225:1,1232:1 
(5.00/95.00/99.7%=94/1225/1232,Outliers=0,obl/obu=0/0)
[SUM] 0.00-3.11 sec  11.5 MBytes  31.0 Mbits/sec  120521/0       414
[ CT] final connect times (min/avg/max/stdev) = 
10.661/14.261/15.423/2023.369 ms (tot/err) = 5/0

> 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)
> 
> 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!iZcFJ8WVU9S
>> [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!iZcFJ8WVU9S9zz5t456oxkfObrC5Xb9j5AG8UO3DqD5x4GAJkawZr0iGwEUtF0_09U8mCDnAkrJ9QEMHGbCMKVw$
>> _______________________________________________
>> Rpm mailing list
>> Rpm at lists.bufferbloat.net
>> https://lists.bufferbloat.net/listinfo/rpm


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