关于mesh节点间吞吐量的询问。About throughput between mesh nodes。

[FPOOOOOOO]

Environment

• Development Kit: ESP32-DevKitC
• Core (if using chip or module): ESP-WROOM-32UE
• Issue language: 中文 english

Problem Description

我目前的需求是在没有路由器的情况下，固定根节点，然后有16个节点通过mesh连接到根节点，每个节点往根节点有1Mbit的吞吐量，也就是根节点需要有16Mbit的吞吐量。我融合了esp-mdf/examples/function_demo/mwifi/console_test 和 esp-mdf/examples/function_demo/mwifi/no_router，经过测试根节点当server还是client，都只有8M左右的吞吐量。mesh的底层也是wifi发送，但是在esp-idf/examples/wifi/iperf中，wifi的速度能够到30M，请问一下这是为什么？有什么办法提高吞吐量到16M？

Now what I want to do is fixing root node without a router, let 16 other non-root node connected to the root node via mesh network. Every non-root node could have a throughput at 1Mbit/s, that is to say the root node could have throughput at 16Mbit/s. I combine two example together to get non-router mesh throughput test——esp-mdf/examples/function_demo/mwifi/console_test AND esp-mdf/examples/function_demo/mwifi/no_router. But whether the root node is server or client, it only has 8M throughput. As I have known, mesh's bottom layer code is wifi, in the esp-idf/examples/wifi/iperfexample ,wifi's throughput could up to 30M, I want to know why mesh's throughput is such low? Is there any method to do to improve the throughput up to 16M?

Debug Logs

15:23:36:077]Tx→⦁mesh_iperf -c c0:49:ef:4b:23:34 -i 1 -l 1000 -t 10
[15:23:36:124]Rx←⦁mesh_iperf -c c0:49:ef:4b:23:34 -i 1 -l 1000 -t 10

[15:23:36:444]Rx←⦁[0;32mI (1308541) [mwifi_test, 673]: ------------------------------------------------------------[0m
[0;32mI (1308542) [mwifi_test, 674]: client c4:de:e2:c0:0a:d4 send to c0:49:ef:4b:23:34[0m
[0;32mI (1308553) [mwifi_test, 675]: ESP-WIFI-MESH layer:
[15:23:36:492]Rx←⦁ 1[0m
[0;32mI (1308553) [mwifi_test, 676]: ------------------------------------------------------------[0m
[0;32mI (1308564) [mwifi_test, 679]: time: 60, interval: 1, len: 1000[0m
[0;32mI (1308575) [mwifi_test, 414]: [    Server MAC   ] Interval       Transfer     Bandwidth[0m
[0;32mmdf> [0m

[15:23:36:804]Rx←⦁[0;32mmdf> [0m
[15:23:37:479]Rx←⦁[0;32mI (1309575) [mwifi_test, 429]: [c0:49:ef:4b:23:34]   0- 1 sec  0.75 MBytes  5.98 Mbits/sec[0m

[15:23:38:480]Rx←⦁[0;32mI (1310576) [mwifi_test, 429]: [c0:49:ef:4b:23:34]   1- 2 sec  1.05 MBytes  8.37 Mbits/sec[0m

[15:23:39:481]Rx←⦁[0;32mI (1311577) [mwifi_test, 429]: [c0:49:ef:4b:23:34]   2- 3 sec  1.06 MBytes  8.46 Mbits/sec[0m

[15:23:40:483]Rx←⦁[0;32mI (1312579) [mwifi_test, 429]: [c0:49:ef:4b:23:34]   3- 4 sec  1.04 MBytes  8.29 Mbits/sec[0m

[15:23:41:484]Rx←⦁[0;32mI (1313580) [mwifi_test, 429]: [c0:49:ef:4b:23:34]   4- 5 sec  1.05 MBytes  8.43 Mbits/sec[0m

[15:23:42:485]Rx←⦁[0;32mI (1314581) [mwifi_test, 429]: [c0:49:ef:4b:23:34]   5- 6 sec  1.07 MBytes  8.59 Mbits/sec[0m

[15:23:43:486]Rx←⦁[0;32mI (1315582) [mwifi_test, 429]: [c0:49:ef:4b:23:34]   6- 7 sec  1.05 MBytes  8.38 Mbits/sec[0m

[15:23:44:487]Rx←⦁[0;32mI (1316583) [mwifi_test, 429]: [c0:49:ef:4b:23:34]   7- 8 sec  1.08 MBytes  8.61 Mbits/sec[0m

[15:23:45:488]Rx←⦁[0;32mI (1317584) [mwifi_test, 429]: [c0:49:ef:4b:23:34]   8- 9 sec  1.10 MBytes  8.78 Mbits/sec[0m

[15:23:46:491]Rx←⦁[0;32mI (1318587) [mwifi_test, 429]: [c0:49:ef:4b:23:34]   9-10 sec  1.09 MBytes  8.72 Mbits/sec[0m

[15:23:47:493]Rx←⦁[0;32mI (1319589) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  10-11 sec  1.09 MBytes  8.74 Mbits/sec[0m

[15:23:48:494]Rx←⦁[0;32mI (1320590) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  11-12 sec  1.05 MBytes  8.38 Mbits/sec[0m

[15:23:49:495]Rx←⦁[0;32mI (1321591) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  12-13 sec  1.08 MBytes  8.67 Mbits/sec[0m

[15:23:50:496]Rx←⦁[0;32mI (1322592) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  13-14 sec  1.06 MBytes  8.52 Mbits/sec[0m

[15:23:51:500]Rx←⦁[0;32mI (1323594) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  14-15 sec  1.06 MBytes  8.47 Mbits/sec[0m

[15:23:52:499]Rx←⦁[0;32mI (1324595) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  15-16 sec  1.05 MBytes  8.39 Mbits/sec[0m

[15:23:53:500]Rx←⦁[0;32mI (1325596) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  16-17 sec  1.05 MBytes  8.44 Mbits/sec[0m

[15:23:54:501]Rx←⦁[0;32mI (1326597) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  17-18 sec  1.05 MBytes  8.37 Mbits/sec[0m

[15:23:55:502]Rx←⦁[0;32mI (1327598) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  18-19 sec  1.05 MBytes  8.42 Mbits/sec[0m

[15:23:56:503]Rx←⦁[0;32mI (1328599) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  19-20 sec  1.07 MBytes  8.57 Mbits/sec[0m

[15:23:57:525]Rx←⦁[0;32mI (1329601) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  20-21 sec  1.05 MBytes  8.42 Mbits/sec[0m

[15:23:58:506]Rx←⦁[0;32mI (1330602) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  21-22 sec  1.00 MBytes  8.03 Mbits/sec[0m

[15:23:59:506]Rx←⦁[0;32mI (1331603) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  22-23 sec  1.00 MBytes  7.99 Mbits/sec[0m

[15:24:0:531]Rx←⦁[0;32mI (1332607) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  23-24 sec  1.03 MBytes  8.22 Mbits/sec[0m

[15:24:1:511]Rx←⦁[0;32mI (1333608) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  24-25 sec  0.99 MBytes  7.94 Mbits/sec[0m

[15:24:2:512]Rx←⦁[0;32mI (1334609) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  25-26 sec  0.94 MBytes  7.52 Mbits/sec[0m

[15:24:3:534]Rx←⦁[0;32mI (1335610) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  26-27 sec  0.91 MBytes  7.25 Mbits/sec[0m

[15:24:4:515]Rx←⦁[0;32mI (1336611) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  27-28 sec  0.97 MBytes  7.74 Mbits/sec[0m

[15:24:5:516]Rx←⦁[0;32mI (1337612) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  28-29 sec  0.98 MBytes  7.82 Mbits/sec[0m

[15:24:6:541]Rx←⦁[0;32mI (1338614) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  29-30 sec  0.96 MBytes  7.66 Mbits/sec[0m

[15:24:7:518]Rx←⦁[0;32mI (1339615) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  30-31 sec  0.98 MBytes  7.82 Mbits/sec[0m

[15:24:8:521]Rx←⦁[0;32mI (1340617) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  31-32 sec  0.97 MBytes  7.80 Mbits/sec[0m

[15:24:9:544]Rx←⦁[0;32mI (1341618) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  32-33 sec  0.98 MBytes  7.82 Mbits/sec[0m

[15:24:10:523]Rx←⦁[0;32mI (1342619) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  33-34 sec  0.98 MBytes  7.84 Mbits/sec[0m

[15:24:11:523]Rx←⦁[0;32mI (1343620) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  34-35 sec  0.96 MBytes  7.66 Mbits/sec[0m

[15:24:12:548]Rx←⦁[0;32mI (1344621) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  35-36 sec  1.00 MBytes  7.98 Mbits/sec[0m

[15:24:13:525]Rx←⦁[0;32mI (1345622) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  36-37 sec  0.98 MBytes  7.85 Mbits/sec[0m

[15:24:14:527]Rx←⦁[0;32mI (1346623) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  37-38 sec  1.00 MBytes  7.99 Mbits/sec[0m

[15:24:15:551]Rx←⦁[0;32mI (1347624) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  38-39 sec  1.00 MBytes  8.04 Mbits/sec[0m

[15:24:16:529]Rx←⦁[0;32mI (1348625) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  39-40 sec  0.99 MBytes  7.89 Mbits/sec[0m

[15:24:17:529]Rx←⦁[0;32mI (1349626) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  40-41 sec  0.98 MBytes  7.86 Mbits/sec[0m

[15:24:18:554]Rx←⦁[0;32mI (1350627) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  41-42 sec  0.93 MBytes  7.44 Mbits/sec[0m

[15:24:19:532]Rx←⦁[0;32mI (1351628) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  42-43 sec  0.94 MBytes  7.50 Mbits/sec[0m

[15:24:20:533]Rx←⦁[0;32mI (1352629) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  43-44 sec  0.92 MBytes  7.34 Mbits/sec[0m

[15:24:21:551]Rx←⦁[0;32mI (1353630) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  44-45 sec  0.94 MBytes  7.50 Mbits/sec[0m

[15:24:22:535]Rx←⦁[0;32mI (1354631) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  45-46 sec  0.95 MBytes  7.58 Mbits/sec[0m

[15:24:23:536]Rx←⦁[0;32mI (1355633) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  46-47 sec  0.95 MBytes  7.57 Mbits/sec[0m

[15:24:24:557]Rx←⦁[0;32mI (1356634) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  47-48 sec  0.97 MBytes  7.77 Mbits/sec[0m

[15:24:25:543]Rx←⦁[0;32mI (1357640) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  48-49 sec  0.95 MBytes  7.61 Mbits/sec[0m

[15:24:26:545]Rx←⦁[0;32mI (1358641) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  49-50 sec  0.95 MBytes  7.60 Mbits/sec[0m

[15:24:27:565]Rx←⦁[0;32mI (1359642) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  50-51 sec  0.98 MBytes  7.81 Mbits/sec[0m

[15:24:28:547]Rx←⦁[0;32mI (1360643) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  51-52 sec  0.96 MBytes  7.70 Mbits/sec[0m

[15:24:29:547]Rx←⦁[0;32mI (1361644) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  52-53 sec  0.95 MBytes  7.60 Mbits/sec[0m

[15:24:30:571]Rx←⦁[0;32mI (1362645) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  53-54 sec  0.97 MBytes  7.75 Mbits/sec[0m

[15:24:31:549]Rx←⦁[0;32mI (1363646) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  54-55 sec  0.95 MBytes  7.62 Mbits/sec[0m

[15:24:32:551]Rx←⦁[0;32mI (1364647) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  55-56 sec  1.02 MBytes  8.14 Mbits/sec[0m

[15:24:33:577]Rx←⦁[0;32mI (1365648) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  56-57 sec  0.96 MBytes  7.70 Mbits/sec[0m

[15:24:34:556]Rx←⦁[0;32mI (1366652) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  57-58 sec  0.95 MBytes  7.57 Mbits/sec[0m

[15:24:35:557]Rx←⦁[0;32mI (1367654) [mwifi_test, 429]: [c0:49:ef:4b:23:34]  58-59 sec  0.97 MBytes  7.78 Mbits/sec[0m

[15:24:36:518]Rx←⦁[0;32mI (1368592) [mwifi_test, 457]: client Report:[0m
[0;32mI (1368592) [mwifi_test, 458]: [ ID] Interval      Transfer       Bandwidth      Jitter   Lost/Total Datagrams[0m
[0;32mI (1368603) [mwifi_test, 461]: [000]  0-60 sec    59.71 MBytes    7.96 Mbits/sec    1 ms    0/59706 (0%)[0m

Other items if possible

我注意到mesh 非根节点的上行速率是限制的，从测试结果来看目前上行速率是能达到1Mbit/s的。如果我要测试根节点下行速率能否达到16M，我得知道非根节点接受速率能否达到16M？不然我没法知道是根节点发不出16M，还是非根节点收不到16M。请问一下有没有好办法知道根节点下行速率能否达到16M？

I notice that mesh non-root node up-stream throughput has a flow control. As the result is above, the non-root up-stream throughput could be 1M. So the problem comes to test whether the root node down-stream throughput could be 16M, to do that I have to know whether the non-root node receive throughput could be 16M? If not, I am not sure it's the root node Tx throughput is not sufficient or the non-root node Rx throughput not sufficient? Please, if you have any idea to test the root node down-stream throughput to be 16M or not, inform me.

@EspHuifeng @zhanzhaocheng

[mmrein]

HI, I did at some point manage to have 13-16 Mbps througput on root, but takes some fiddling around. Your 8M is a good start. Some non-exhaustive list of notes you can try:

• Try increasing flash speed: Serial flasher config -> Flash SPI Mode -> QIO (def DIO) and Serial flasher config -> Flash SPI speed -> 80 MHz (def 40 MHz). This one made a huge difference in my app.
• Try various WiFi driver optimizations as per this table: https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/wifi.html#how-to-configure-parameters
• Try to optimize each core utilization for your usecase (using xTaskCreatePinnedToCore ) and try different task priorities. That can make a big difference too (positive or negative). Can also try increasing a task sizes.
• Enable IRAM optimization for LWIP and some other components (wifi, mesh..) if available and if you have enough memory. This will differ according to your compiler options, so you can try various combinations.
• Make sure you are running full speed and both cores: Component config -> ESP32-secific -> CPU Frequency -> 240MHz and Component config -> Free RTOS -> uncheck: "run only on first core"