anchao commented on PR #7616:
URL: https://github.com/apache/nuttx/pull/7616#issuecomment-1336864141
I tested the loopback, the protocol stack works as expected,
```
nsh> iperf -s -i 1 &
iperf [23:100]
nsh> IP: 10.0.0.2
mode=tcp-server sip=10.0.0.2:5001,dip=0.0.0.0:5001, interval=1, time=0
nsh> iperf -c 10.0.0.2 -i 1
IP: 10.0.0.2
mode=tcp-client sip=10.0.0.2:5001,dip=10.0.0.2:5001, interval=1, time=30
accept: 10.0.0.2,4119
Interval Transfer Bandwidth
Interval Transfer Bandwidth
0.00- 1.01 sec 3735552 Bytes 29.73 Mbits/sec
0.00- 1.01 sec 3735552 Bytes 29.72 Mbits/sec
1.01- 2.02 sec 7487488 Bytes 29.72 Mbits/sec
1.01- 2.02 sec 7487488 Bytes 29.72 Mbits/sec
2.02- 3.03 sec 11255808 Bytes 29.85 Mbits/sec
2.02- 3.03 sec 11255808 Bytes 29.84 Mbits/sec
3.03- 4.04 sec 15007744 Bytes 29.72 Mbits/sec
3.03- 4.04 sec 15007744 Bytes 29.72 Mbits/sec
4.04- 5.05 sec 18776064 Bytes 29.85 Mbits/sec
4.04- 5.05 sec 18776064 Bytes 29.86 Mbits/sec
```
could you try to adjust CONFIG_IOB_THROTTLE to 16 to check if there is any
improvement?
```
CONFIG_IOB_THROTTLE=16
```
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