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LCD-7: a 64 KB data cache as well - #20
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On top of #17's 64-byte lines and 32 KB instruction cache. Measured with the board decoding and streaming audio while the LVGL UI runs: full redraw 205 -> 147 ms, panel switch 88 -> 59 ms, 30 list rows built 780 -> 399 ms and laid out 608 -> 335 ms. The same layout is ~216x faster on a desktop: the board is memory-bound and the data cache is the lever. Internal RAM free goes 54 -> 23 KB; a 30-minute soak of real use (about 25 track skips and picks, Wi-Fi streaming, the USB host running) kept a minimum of 17 KB with no allocation failures, Wi-Fi drops or audio stalls. The fragment's header no longer names the applications it was measured with; it describes them.
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Follow-up to #17. Adds
CONFIG_ESP32S3_DATA_CACHE_64KB=yto the Waveshare ESP32-S3-Touch-LCD-7'ssdkconfig.lcd7.#17 left this out because it cuts internal RAM to ~13 KB free. It has now been soaked under real load. Measured while the board both runs an LVGL remote-control UI and decodes and streams audio to a USB sound card on its native port:
The same LVGL layout runs about 216× faster on a desktop, so this board is memory-bound (LVGL's objects live in PSRAM), and the data cache is the main lever left.
Soak: 30 minutes of real use: about 25 track skips and picks, Wi-Fi streaming, the USB host running. The minimum internal RAM free was 17 KB. There were no allocation failures, no Wi-Fi drops and no audio stalls. The earlier out-of-memory failure (24 bytes of DMA RAM free) came from every malloc under 8 KB going to internal RAM; the fragment's
SPIRAM_MALLOC_ALWAYSINTERNAL=512already fixes that.The fragment's header comment also stops naming the specific applications it was measured with; it describes them instead.