Feedback on benchmarking results of SDHCI and MMCCAM driver

Peter Jeremy peter at
Mon May 14 21:42:05 UTC 2018

On 2018-May-15 02:48:43 +0530, Udit agarwal <dev.madaari at> wrote:
>I have conducted several sd card benchmarking tests on FreeBSD 11.1, with
>both SDHCI and the newly incorporated MMCCAM driver to compare their
>performance under different conditions.

Some questions:
1) How reproduceable are the results?  Have you performed the test multiple times
to check for variance?
2) How did you prepare the SD card prior to each write test?  Flash write tests
are extremely sensitive to hidden move/rewrite and erase cycles performed by the
flash translation layer.
3) Have you tried different SD cards from different manufacturers to see if the
drivers happen to interact well or badly with the specific flash implementation.

Peter Jeremy
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