Date: Tue, 15 May 2018 03:21:00 +0530 From: Udit agarwal <dev.madaari@gmail.com> To: Peter Jeremy <peter@rulingia.com> Cc: freebsd-questions@freebsd.org, freebsd-arm@freebsd.org Subject: Re: Feedback on benchmarking results of SDHCI and MMCCAM driver Message-ID: <CAM0bxh9aXuu-psXk2i0kCdaryLxRDceh49khW_iC7bnafVu_%2BQ@mail.gmail.com> In-Reply-To: <20180514214135.GB86457@server.rulingia.com> References: <CAM0bxh9NfaAFmGjxp8nXOPCx5QGFRFMmKPHsxX5jXkUJt%2BG5uw@mail.gmail.com> <20180514214135.GB86457@server.rulingia.com>
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On Tue, May 15, 2018 at 3:11 AM, Peter Jeremy <peter@rulingia.com> wrote: > On 2018-May-15 02:48:43 +0530, Udit agarwal <dev.madaari@gmail.com> 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? > 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 write > tests > are extremely sensitive to hidden move/rewrite and erase cycles performed > by the > flash translation layer. > Before each test, I freshly recreated the filesystem to remove any trace of the previous tests. Moreover, I have mounted/unmounted the device to purge 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 would be interesting to figure out the interaction of the driver with different flash implementations. I'll perform these tests ASAP. Regards, Udit > > -- > Peter Jeremy >
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