nuttxs opened a new pull request, #16684:
URL: https://github.com/apache/nuttx/pull/16684
## Summary
The ARP implementation overly strict expiration check mechanism. When an ARP
entry expires, data packets are immediately discarded, causing TCP connections
to pause and wait for ARP to resolve again.
Reducing unnecessary ARP requests can mitigate network congestion and avoid
packet delays caused by waiting for ARP responses.
## Impact
New Feature/Change: arp optimize
User Impact: Prevent file descriptor leakage.
Build Impact:No new Kconfig options or build system changes.
Hardware Impact: No
Security: No
Compatibility: Backward-compatible; no breaking changes.
## Testing
Verification phenomenon: iperf+TCP communication
1. During high-speed communication (e.g., iperf), an abnormal throughput
drop occurs due to ARP expiration checks.
2. The problem reproduction cycle is consistent with the NET_ARP_MAXAGE
duration.
(To facilitate issue reproduction, temporarily reduce NET_ARP_MAXAGE)
```
Interval Transfer Bandwidth
0.00- 1.00 sec 2310144 Bytes 18.47 Mbits/sec
1.00- 2.00 sec 2326528 Bytes 18.60 Mbits/sec
2.00- 3.00 sec 2326528 Bytes 18.60 Mbits/sec
3.00- 4.00 sec 2342912 Bytes 18.73 Mbits/sec
4.00- 5.00 sec 2326528 Bytes 18.60 Mbits/sec
5.00- 6.00 sec 2326528 Bytes 18.60 Mbits/sec
6.00- 7.00 sec 2326528 Bytes 18.60 Mbits/sec
7.00- 8.00 sec 2326528 Bytes 18.60 Mbits/sec
8.00- 9.00 sec 2326528 Bytes 18.60 Mbits/sec
9.00- 10.01 sec 2375680 Bytes 18.99 Mbits/sec
10.01- 11.01 sec 2375680 Bytes 18.99 Mbits/sec
11.01- 12.01 sec 1064960 Bytes **8.51 Mbits/sec**
12.01- 13.01 sec 114688 Bytes **0.92 Mbits/sec**
13.01- 14.01 sec 2326528 Bytes 18.60 Mbits/sec
14.01- 15.01 sec 2326528 Bytes 18.60 Mbits/sec
```
After fixed, there is no longer a through exception reduction issue.
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