diff options
| author | Luke Hoersten <[email protected]> | 2026-06-15 07:59:44 -0500 |
|---|---|---|
| committer | Luke Hoersten <[email protected]> | 2026-06-15 07:59:44 -0500 |
| commit | ec8d498ba5040b7ba862211975d2043baa6e5536 (patch) | |
| tree | 7fdbc2f50a0608718ad3058659ae4f5f3a663992 /sdkconfig.defaults | |
| parent | d949b19a6b89b9e74e8706bafa1d1396ac8f17f8 (diff) | |
sdkconfig: revert TCP window bump — net-negative on /frame path
Bumping WND/SND_BUF to 32 KiB + RECVMBOX to 16 + SACK on regressed
ttfb from ~350µs to ~1.2ms across every frame and introduced periodic
250+ms body stalls (TCP retransmit on the larger window). Mean body
unchanged. Reason: Scrypted's per-frame fetch() opens a fresh TCP
socket, so the larger receive window just slows slow-start on every
new connection rather than helping.
Reverted to lwIP defaults. The real fix is HTTP keep-alive on the
Scrypted side; will revisit window tuning once persistent connections
are in place. README backlog updated with what we learned.
Diffstat (limited to 'sdkconfig.defaults')
| -rw-r--r-- | sdkconfig.defaults | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/sdkconfig.defaults b/sdkconfig.defaults index 638f6e8..4c50a23 100644 --- a/sdkconfig.defaults +++ b/sdkconfig.defaults @@ -29,6 +29,14 @@ CONFIG_LWIP_IPV4=y CONFIG_LWIP_IPV6=y CONFIG_MDNS_MAX_INTERFACES=1 +# TCP receive-window tuning attempted (WND/SND_BUF=32k, RECVMBOX=16, +# SACK on). Measured net-negative on the /frame path: ttfb regressed +# from ~350µs to ~1.2ms, body unchanged, and periodic 250+ms stalls +# appeared. Reason: Scrypted's per-frame fetch() opens a fresh TCP +# socket each time, so the larger window just slows slow-start. +# Reverted; revisit once we switch to HTTP keep-alive on the Scrypted +# side. Keeping the lwIP defaults. + # HTTP server CONFIG_HTTPD_MAX_REQ_HDR_LEN=1024 CONFIG_HTTPD_MAX_URI_LEN=512 |