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YAMAMOTO Takashi
837e1a72a4
* Send data chunk-by-chunk Note: A stream socket doesn't have atomicity requirement. * Increase the chance to use full-sized segments Benchmark numbers in my environment: * Over ESP32 wifi * The peer is NetBSD, which has traditional delayed ack TCP * iperf uses 16384 bytes buffer --- without this patch, CONFIG_IOB_NBUFFERS=36 CONFIG_IOB_BUFSIZE=196 does not work. see https://github.com/apache/incubator-nuttx/pull/2772#discussion_r592820639 --- without this patch, CONFIG_IOB_NBUFFERS=128 CONFIG_IOB_BUFSIZE=196 ``` nsh> iperf -c 192.168.8.1 IP: 192.168.8.103 mode=tcp-client sip=192.168.8.103:5001,dip=192.168.8.1:5001, interval=3, time=30 Interval Bandwidth 0- 3 sec, 4.11 Mbits/sec 3- 6 sec, 4.63 Mbits/sec 6- 9 sec, 4.89 Mbits/sec 9- 12 sec, 4.63 Mbits/sec 12- 15 sec, 4.85 Mbits/sec 15- 18 sec, 4.85 Mbits/sec 18- 21 sec, 5.02 Mbits/sec 21- 24 sec, 3.67 Mbits/sec 24- 27 sec, 4.94 Mbits/sec 27- 30 sec, 4.81 Mbits/sec 0- 30 sec, 4.64 Mbits/sec nsh> ``` --- with this patch, CONFIG_IOB_NBUFFERS=36 CONFIG_IOB_BUFSIZE=196 ``` nsh> iperf -c 192.168.8.1 IP: 192.168.8.103 mode=tcp-client sip=192.168.8.103:5001,dip=192.168.8.1:5001, interval=3, time=30 Interval Bandwidth 0- 3 sec, 5.33 Mbits/sec 3- 6 sec, 5.59 Mbits/sec 6- 9 sec, 5.55 Mbits/sec 9- 12 sec, 5.59 Mbits/sec 12- 15 sec, 5.59 Mbits/sec 15- 18 sec, 5.72 Mbits/sec 18- 21 sec, 5.68 Mbits/sec 21- 24 sec, 5.29 Mbits/sec 24- 27 sec, 4.67 Mbits/sec 27- 30 sec, 4.50 Mbits/sec 0- 30 sec, 5.35 Mbits/sec nsh> ``` --- with this patch, CONFIG_IOB_NBUFFERS=128 CONFIG_IOB_BUFSIZE=196 ``` nsh> iperf -c 192.168.8.1 IP: 192.168.8.103 mode=tcp-client sip=192.168.8.103:5001,dip=192.168.8.1:5001, interval=3, time=30 Interval Bandwidth 0- 3 sec, 5.51 Mbits/sec 3- 6 sec, 4.67 Mbits/sec 6- 9 sec, 4.54 Mbits/sec 9- 12 sec, 5.42 Mbits/sec 12- 15 sec, 5.37 Mbits/sec 15- 18 sec, 5.11 Mbits/sec 18- 21 sec, 5.07 Mbits/sec 21- 24 sec, 5.29 Mbits/sec 24- 27 sec, 5.77 Mbits/sec 27- 30 sec, 4.63 Mbits/sec 0- 30 sec, 5.14 Mbits/sec nsh> ```