wengzhe opened a new pull request, #9844:
URL: https://github.com/apache/nuttx/pull/9844
## Summary
Patches included:
- net: Rename `tcp_dataconcat` to `net_iob_concat`
- Allow other protocols like UDP to use concat logic. (No logic change)
- net/udp: Change `conn->readahead` to I/O buffer chain
- When using IOB queue to store `readahead` data, we use one IOB for each
UDP packet. Then if the packets are very small, like 10Bytes per packet, we'll
use ~1600 IOBs just for 16KB recv buffer size, which is wasteful and dangerous.
So change `conn->readahead` to a single IOB chain like TCP.
- Benefits:
- Using memory and IOBs more efficiently (small packets are common case
in UDP)
- Side effects:
- UDP recv buffer size may count the overhead
- A little bit drop in UDP recv performance (<1%, more seek & copy)
## Impact
UDP receive buffer
## Testing
Manually, on sim and actual product.
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