4a69d77b38
Tune the TCP stack and driver resources for the WHC Wi-Fi data path on both rtl8720f_evb and pke8721daf (NuttX runs on the application core; the Wi-Fi MAC runs on a companion core reached over an on-chip IPC): - Cap the advertised TCP receive window (NET_RECV_BUFSIZE=10000) to about the out-of-order reassembly capacity and bound in-flight TX (NET_SEND_BUFSIZE=16384). The stock unbounded window/queue let the peer and the local stack burst far more than the Wi-Fi path can smooth, causing bursty loss/reordering and RTO stalls (RX), and starving incoming-ACK processing so the peer window collapses and spurious retransmits tear the link down (TX). - Keep out-of-order reassembly (NET_TCP_OUT_OF_ORDER) but disable selective ACK. PR #19353 enabled NET_TCP_SELECTIVE_ACK on both boards; on the lossy Wi-Fi TX path the sender-side selective-ACK recovery does not reliably repair multi-segment holes and stalls TX, so NewReno with out-of-order reassembly is used instead -- same steady-state throughput, robust recovery. - Widen IOB buffers to 512 bytes; the window and out-of-order buffers draw from the shared IOB pool at run time and add no static memory. - Drop the busy-wait retry in the transmit path (the send-buffer cap makes it dead code) and lower the forced host TX skb count (skb_num_ap) to 8, which covers the NP's transient TX backlog without over-reserving AP heap. Signed-off-by: raul_chen <raul_chen@realsil.com.cn> |
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| .github | ||
| arch | ||
| audio | ||
| binfmt | ||
| boards | ||
| cmake | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| dummy | ||
| fs | ||
| graphics | ||
| include | ||
| libs | ||
| mm | ||
| net | ||
| openamp | ||
| pass1 | ||
| sched | ||
| syscall | ||
| tools | ||
| video | ||
| wireless | ||
| .asf.yaml | ||
| .codespell-ignore-lines | ||
| .codespellrc | ||
| .editorconfig | ||
| .gitignore | ||
| .gitmessage | ||
| .pre-commit-config.yaml | ||
| .yamllint | ||
| AUTHORS | ||
| CMakeLists.txt | ||
| CONTRIBUTING.md | ||
| INVIOLABLES.md | ||
| Kconfig | ||
| LICENSE | ||
| Makefile | ||
| NOTICE | ||
| README.md | ||
| ReleaseNotes | ||
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.
Getting Started
First time on NuttX? Read the Getting Started guide! If you don't have a board available, NuttX has its own simulator that you can run on terminal.
Documentation
You can find the current NuttX documentation on the Documentation Page.
Alternatively, you can build the documentation yourself by following the Documentation Build Instructions.
The old NuttX documentation is still available in the Apache wiki.
Supported Boards
NuttX supports a wide variety of platforms. See the full list on the Supported Platforms page.
Contributing
If you wish to contribute to the NuttX project, read the Contributing guidelines for information on Git usage, coding standard, workflow and the NuttX principles.
License
The code in this repository is under either the Apache 2 license, or a license compatible with the Apache 2 license. See the License Page for more information.