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lwIP: 16 sockets so web clients are not starved

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With the default 10, PTP (2), AES67 TX, SAP, syslog and httpd's
listen/control sockets left ~3 for web clients although httpd allows 7.
A browser's keep-alive connections then made new requests fail with a
reset for seconds at a time (the intermittent 'outages').
Reproduced: with 1 idle connection held, new requests were reset.
After: 6 idle connections held, new requests answered in 6-7 ms.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Ben Nicholson
2026-09-25 07:35:02 +10:00
parent e2dc7552c2
commit 6d85eb49f8
1 changed files with 5 additions and 0 deletions
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sdkconfig.defaults
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@@ -19,3 +19,8 @@ CONFIG_ESPTOOLPY_FLASHSIZE_32MB=y
# LLDP and PTP send raw frames from their own tasks next to lwIP: serialise EMAC transmits # LLDP and PTP send raw frames from their own tasks next to lwIP: serialise EMAC transmits
CONFIG_ETH_TRANSMIT_MUTEX=y CONFIG_ETH_TRANSMIT_MUTEX=y
# lwIP default is 10 sockets; PTP (2), AES67 TX, SAP, syslog and httpd's listen/control sockets
# use 7, leaving ~3 for web clients (httpd allows 7): a browser's keep-alive connections then
# starve new requests. 16 = 7 others + 7 web clients + OTA self-test client + 1 spare.
CONFIG_LWIP_MAX_SOCKETS=16