Feedback on benchmarking results of SDHCI and MMCCAM driver
russ.haley at gmail.com
Mon May 14 23:22:48 UTC 2018
On Mon, May 14, 2018 at 4:18 PM, Russell Haley <russ.haley at gmail.com> wrote:
> On Mon, May 14, 2018 at 2:51 PM, Udit agarwal <dev.madaari at gmail.com>
>> On Tue, May 15, 2018 at 3:11 AM, Peter Jeremy <peter at rulingia.com> wrote:
>> > On 2018-May-15 02:48:43 +0530, Udit agarwal <dev.madaari at gmail.com>
>> > >I have conducted several sd card benchmarking tests on FreeBSD 11.1,
>> > >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?
> The images that Udit is using for his tests can be made available for
> verification if that's desirable (we have a webserver available). His blogs
> are very good as well.
Sorry, sent before adding the blog address: http://126.96.36.199/wordpress/
>> Yes, i have carried these tests multiple time and the results are pretty
>> consistent upto 0.1MBPS.
>> > 2) How did you prepare the SD card prior to each write test? Flash
>> > tests
>> > are extremely sensitive to hidden move/rewrite and erase cycles
>> > by the
>> > flash translation layer.
>> Before each test, I freshly recreated the filesystem to remove any trace
>> the previous tests. Moreover, I have mounted/unmounted the device to
>> any data in the cache.
>> > 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.
>> No, currently i havn't experimented with different sd cards. True, it
>> be interesting to figure out the interaction of the driver with different
>> flash implementations. I'll perform these tests ASAP.
> I'll just point out that Udits SGOC project has nothing to do with the
> flash implementation of the cards. Udit, I would hesitate to go down the
> road of multiple card tests unless you have a great deal of spare time.
> There are far more pertinent questions that can be asked about the variance
> between SDHCI and SDIO implementations. There is still the little detail of
> porting to RTEMS too. :)
>> > --
>> > Peter Jeremy
>> freebsd-arm at freebsd.org mailing list
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