nuttx

History

YAMAMOTO Takashi 837e1a72a4 tcp_send_buffered.c: improve tcp write buffering

* 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>
```

2021-03-22 01:12:59 -07:00

Kconfig

net/tcp: implement the fast retransmit

2020-12-01 11:36:10 -06:00

Make.defs

net: Author Gregory Nutt: update licenses to Apache

2021-02-20 00:38:18 -08:00

tcp_accept.c

net: Author Gregory Nutt: update licenses to Apache

2021-02-20 00:38:18 -08:00

tcp_appsend.c

net/tcp/tcp_appsend.c: Fix syslog formats