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This is necessary for ESP32-C2 Wi-Fi & BT to work reliably (and for TLS to work at all). On IDF 5.4.2 the free static RAM goes from 60KB to 100KB, and there will also be a reduction in lwIP & Wi-Fi memory use at runtime. The performance trade-off seems low for most use cases, although it will probably be significant for certain combinations of load (i.e. heavy TCP/IP, heavy BT throughput, and some peripheral driver functions). Added as a set of config flags because this is potentially useful on other SoCs where the goal is to maximise RAM available for MicroPython. This work was funded through GitHub Sponsors. Signed-off-by: Angus Gratton <angus@redyak.com.au>
45 lines
1.7 KiB
Plaintext
45 lines
1.7 KiB
Plaintext
# This is a collection of sdkconfig settings that frees RAM at runtime,
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# at the expense of performance.
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#
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# Not all options will work on all SoC families, but adding this sdkconfig
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# set to a board should increase the free memory.
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#
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# - Many options free IRAM, which on most ESP32 families leads to
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# free DRAM at runtime (original ESP32 and S2 may not).
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# - The other options reduce runtime DRAM usage from the heap.
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#
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# IMPORTANT: If you enable these config settings on a custom build then you may
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# encounter bugs or crashes. If you choose to open a MicroPython bug report then
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# please mention these config settings!
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# Place functions in flash whenever possible to free IRAM
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CONFIG_RINGBUF_PLACE_FUNCTIONS_INTO_FLASH=y
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CONFIG_FREERTOS_PLACE_FUNCTIONS_INTO_FLASH=y
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CONFIG_HEAP_PLACE_FUNCTION_INTO_FLASH=y
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# Use the SPI flash functions in ROM (when available). This may limit flash chip
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# support and cause issues with some flash chips. Each SoC family has different
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# set of chip support baked into ROM.
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CONFIG_SPI_FLASH_ROM_IMPL=y
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# Run the Bluetooth controller from flash not IRAM
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CONFIG_BT_CTRL_RUN_IN_FLASH_ONLY=y
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# lwIP adjustments to limit runtime memory usage (at expense of performance, and/or
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# a reduction in number of active connections).
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CONFIG_LWIP_TCPIP_RECVMBOX_SIZE=16
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CONFIG_LWIP_MAX_SOCKETS=6
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CONFIG_LWIP_MAX_ACTIVE_TCP=8
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# These lwIP values are recommended to scale relative to the Wi-Fi buffer numbers
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CONFIG_LWIP_TCP_WND_DEFAULT=3072
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CONFIG_LWIP_TCP_SND_BUF_DEFAULT=3072
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# Wi-Fi adjustments to reduce peak runtime memory usage, at expense of peak
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# performance
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CONFIG_ESP_WIFI_STATIC_RX_BUFFER_NUM=8
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CONFIG_ESP_WIFI_DYNAMIC_RX_BUFFER_NUM=12
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CONFIG_ESP_WIFI_DYNAMIC_TX_BUFFER_NUM=12
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CONFIG_ESP_WIFI_RX_MGMT_BUF_NUM_DEF=2
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CONFIG_ESP_WIFI_RX_BA_WIN=12
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