The QPACK_MAX_TABLE_CAPACITY=0 advertisement worsened the result
(1 file → 0 files written). Empirical: empty SETTINGS = spec defaults
(both 0) and aioquic was already sending literal-encoded responses
under that condition.
Real bug isn't QPACK — diagnostic showed 1359 GETs processed in 58s
(~23 streams/sec). Throughput is hard-bottlenecked by :quic's single
conn.lock serializing send loop + read loop + openBidiStream across
1999 waiting coroutines. Even at maximum throughput we'd only complete
~1400 of 1999 in 60s. The 1 file we managed previously was just the
first response landing before lock contention spiked.
Filed multiplexing as a known-throughput-limit follow-up. Possible
fixes (per-level lock split / Semaphore-bounded concurrency / QPACK
dynamic-table support) are all non-trivial and the testcase is a
stress test, not a real-world load shape.
For now: revert to empty SETTINGS, accept multiplexing as the lone
deferred testcase. Aioquic + picoquic stay at 6/7.
https://claude.ai/code/session_01HcvfQq1ttPV9PkRoJb4nyT
Claude
4e00c8db07