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Pipeline NFC writes to avoid delayed ACK and RTT stalls

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Send each AIO write as one buffer with TCP_NODELAY, and keep four
IOs in flight so FastLZ and multi-chunk writes are not serialized.

Co-authored-by: Cursor <[email protected]>
This commit is contained in:
Lucian Petrut
2026-09-07 13:51:24 +00:00
co-authored by Cursor
parent 33b6a3967b
commit d0a6de03d2
3 changed files with 60 additions and 28 deletions
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docs/reverse_engineering_procedure.md
+3 -2
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@@ -248,8 +248,9 @@ the ticket switched from `NfcGetVmFiles` to `NfcRandomAccessOpenDisk`
`NfcRandomAccessOpenDisk`). Integration tests create a temporary empty
10 GiB VM for the run so writes cannot land on other lab disks.
The Python client splits writes larger than 64 KiB; it does not send a
single oversized write the way VDDK sends an oversized read. Details:
The Python client splits writes larger than 64 KiB into AIO chunks and
keeps up to four in flight (`NfcAioInitSession` buffer count). Header
and extra go in one `sendall`, with `TCP_NODELAY`. Details:
`docs/nfc_write.md`. Proof: write then read in
`tests/integration/test_nfc_read_write.py` and the VDDK cross-check in
`tests/integration/test_crosscheck.py`.