On Fri, Jun 27, 2025 at 10:47 PM Kevin Oberman <[email protected]> wrote:
> On Fri, Jun 27, 2025 at 3:53 PM Bjoern A. Zeeb <[email protected]> wrote: > >> On Fri, 27 Jun 2025, Kevin Oberman wrote: >> >> > Sorry that this took so long. I finally got around to trying an iperf3 >> test >> > and it looks just about the same my speedtest. I am really surprised at >> the >> > upload speed. It's about what I was seeing using netspeed, but that is >> > about at my max upload of 40M. ifconfig shows media: IEEE 802.11 >> Wireless >> > Ethernet VHT mode 11ac. >> >> I assume the channel is equally vht/80 and the linuxkpi sysctl would not >> show anything else as before. >> >> >> Your Cwnd stays very low. Can you try UDP as well? >> >> >> A normal TX run here: >> >> [ ID] Interval Transfer Bitrate Retr Cwnd >> [ 5] 0.00-1.01 sec 95.8 MBytes 797 Mbits/sec 0 1.62 MBytes >> [ 5] 1.01-2.01 sec 99.8 MBytes 836 Mbits/sec 0 1.62 MBytes >> [ 5] 2.01-3.01 sec 99.6 MBytes 837 Mbits/sec 0 1.62 MBytes >> [ 5] 3.01-4.01 sec 101 MBytes 842 Mbits/sec 0 1.62 MBytes >> [ 5] 4.01-5.00 sec 98.6 MBytes 835 Mbits/sec 0 1.62 MBytes >> [ 5] 5.00-6.00 sec 100 MBytes 839 Mbits/sec 0 1.62 MBytes >> [ 5] 6.00-7.00 sec 100 MBytes 839 Mbits/sec 0 1.62 MBytes >> [ 5] 7.00-8.01 sec 94.5 MBytes 790 Mbits/sec 0 1.62 MBytes >> [ 5] 8.01-9.01 sec 101 MBytes 847 Mbits/sec 0 1.62 MBytes >> [ 5] 9.01-10.01 sec 100 MBytes 840 Mbits/sec 0 1.62 MBytes >> - - - - - - - - - - - - - - - - - - - - - - - - - >> [ ID] Interval Transfer Bitrate Retr >> [ 5] 0.00-10.01 sec 991 MBytes 831 Mbits/sec 0 >> sender >> [ 5] 0.00-10.02 sec 991 MBytes 830 Mbits/sec >> receiver >> >> >> And a TX run with retransmit (you can see the recovery): >> >> [ ID] Interval Transfer Bitrate Retr Cwnd >> [ 5] 0.00-1.00 sec 90.2 MBytes 753 Mbits/sec 0 1.62 MBytes >> [ 5] 1.00-2.03 sec 73.0 MBytes 600 Mbits/sec 0 1.62 MBytes >> [ 5] 2.03-3.01 sec 49.0 MBytes 417 Mbits/sec 271 313 KBytes >> [ 5] 3.01-4.00 sec 43.0 MBytes 364 Mbits/sec 0 483 KBytes >> [ 5] 4.00-5.00 sec 47.0 MBytes 394 Mbits/sec 0 615 KBytes >> [ 5] 5.00-6.06 sec 58.9 MBytes 466 Mbits/sec 0 729 KBytes >> [ 5] 6.06-7.01 sec 54.1 MBytes 480 Mbits/sec 0 811 KBytes >> [ 5] 7.01-8.00 sec 89.4 MBytes 752 Mbits/sec 0 871 KBytes >> [ 5] 8.00-9.00 sec 98.8 MBytes 829 Mbits/sec 0 914 KBytes >> [ 5] 9.00-10.01 sec 98.0 MBytes 817 Mbits/sec 0 943 KBytes >> - - - - - - - - - - - - - - - - - - - - - - - - - >> [ ID] Interval Transfer Bitrate Retr >> [ 5] 0.00-10.01 sec 702 MBytes 588 Mbits/sec 271 >> sender >> [ 5] 0.00-10.02 sec 702 MBytes 587 Mbits/sec >> receiver >> >> >> >> Here's the server side for a -R run (RX as seen from client side): >> >> [ ID] Interval Transfer Bitrate Retr Cwnd >> [ 5] 0.00-1.01 sec 25.4 MBytes 212 Mbits/sec 0 752 KBytes >> [ 5] 1.01-2.00 sec 23.5 MBytes 198 Mbits/sec 0 795 KBytes >> [ 5] 2.00-3.00 sec 23.5 MBytes 197 Mbits/sec 0 835 KBytes >> [ 5] 3.00-4.01 sec 21.9 MBytes 183 Mbits/sec 0 873 KBytes >> [ 5] 4.01-5.01 sec 22.2 MBytes 187 Mbits/sec 0 908 KBytes >> [ 5] 5.01-6.00 sec 23.1 MBytes 195 Mbits/sec 0 944 KBytes >> [ 5] 6.00-7.01 sec 27.0 MBytes 225 Mbits/sec 0 983 KBytes >> [ 5] 7.01-8.01 sec 23.4 MBytes 196 Mbits/sec 0 1017 KBytes >> [ 5] 8.01-9.01 sec 23.2 MBytes 195 Mbits/sec 0 1.02 MBytes >> [ 5] 9.01-10.01 sec 26.4 MBytes 221 Mbits/sec 0 1.13 MBytes >> [ 5] 10.01-10.01 sec 128 KBytes 606 Mbits/sec 0 1.13 MBytes >> >> >> -- >> Bjoern A. Zeeb r15:7 >> > > Since both directions were the same, I'll keep it short. > Transmit (Upload): > [ ID] Interval Transfer Bitrate Jitter Lost/Total > Datagrams > [ 5] 0.00-10.00 sec 1.25 MBytes 1.05 Mbits/sec 0.000 ms 0/899 (0%) > sender > [ 5] 0.00-10.00 sec 1.25 MBytes 1.05 Mbits/sec 0.275 ms 0/899 (0%) > receiver > Receive (Download): > [ ID] Interval Transfer Bitrate Jitter Lost/Total > Datagrams > [ 5] 0.00-10.00 sec 1.25 MBytes 1.05 Mbits/sec 0.000 ms 0/898 (0%) > sender > [ 5] 0.00-10.00 sec 1.25 MBytes 1.05 Mbits/sec 0.572 ms 0/898 (0%) > receiver > Been too long since I used iperf2 and this is the first time I've used iperf3. Forgot to set the bitrate, do it defaulted to 1Mbs. Download still sucks. [ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams [ 5] 0.00-10.00 sec 59.6 MBytes 50.0 Mbits/sec 0.000 ms 0/42824 (0%) sender [ 5] 0.00-10.00 sec 38.8 MBytes 32.5 Mbits/sec 0.403 ms 12592/40453 (31%) receiver Upload looks much better: [ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams [ 5] 0.00-10.00 sec 715 MBytes 600 Mbits/sec 0.000 ms 0/513750 (0%) sender [ 5] 0.00-12.55 sec 715 MBytes 478 Mbits/sec 0.099 ms 0/513750 (0%) receiver Really annoying that the download speed is what I'd like to see improved. Router? It's an old ASUS released in 2016. -- Kevin Oberman, Part time kid herder and retired Network Engineer E-mail: [email protected] PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683
