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Posted to commits@mynewt.apache.org by GitBox <gi...@apache.org> on 2019/03/29 13:28:03 UTC

[GitHub] [mynewt-core] kasjer opened a new pull request #1731: spiflash: Add simple cache

kasjer opened a new pull request #1731: spiflash: Add simple cache
URL: https://github.com/apache/mynewt-core/pull/1731
 
 
   Reading 1 byte from spiflash generates 5 bytes of SPI traffic.
   Reading 8 bytes on by one is 40 bytes on SPI.
   Reading 8 bytes at once is 12 bytes on SPI.
   This change improves reading time when there are a lot of small
   read requests.
   This can be useful if FCB is stored on external spiflash.
   Tested on 440KB FCB that stored CBOR data
   fcb_walk time in ms
   no cache:   53625     100%
    4 bytes:   41570      77%
    8 bytes:   38695      72%
   12 bytes:   36695      68%
   16 bytes:   37031      69%
   20 bytes:   36875      68%

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