getting some work done today on a Raspberry Pi 3. CPU throughput seems decent but it's still way laggy, maybe FS on microsd card sucks?
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Actually according to WP, microSD can go up to 50 MHz (50 Mbit/sec) over normal 1-bit SPI. Still slow & Linux makes it slower.
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AFAICT there's literally a scheduler round-trip for every 512-byte sector transfer, ...
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...even if a dma-capable spi master could queue 1000s of them in principle. Yields latency between every pair of sectors.
End of conversation
New conversation -
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Need external https://en.wikipedia.org/wiki/Universal_Flash_Storage …. It's what flagship Android phones are using internally these days.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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