Date: Mon, 14 May 2018 16:22:45 -0700 From: Russell Haley <russ.haley@gmail.com> To: Udit agarwal <dev.madaari@gmail.com> Cc: Peter Jeremy <peter@rulingia.com>, freebsd-arm <freebsd-arm@freebsd.org>, freebsd-questions@freebsd.org Subject: Re: Feedback on benchmarking results of SDHCI and MMCCAM driver Message-ID: <CABx9NuT-_n11-sOMA=qJ3QYHTx_XzE_XD8SZXizwozO2JJ%2Bfmw@mail.gmail.com> In-Reply-To: <CABx9NuTnpLTOaCUNDOJA%2BJUpft2K7BjLu24AUC_u6Kvam0fSdA@mail.gmail.com> References: <CAM0bxh9NfaAFmGjxp8nXOPCx5QGFRFMmKPHsxX5jXkUJt%2BG5uw@mail.gmail.com> <20180514214135.GB86457@server.rulingia.com> <CAM0bxh9aXuu-psXk2i0kCdaryLxRDceh49khW_iC7bnafVu_%2BQ@mail.gmail.com> <CABx9NuTnpLTOaCUNDOJA%2BJUpft2K7BjLu24AUC_u6Kvam0fSdA@mail.gmail.com>
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On Mon, May 14, 2018 at 4:18 PM, Russell Haley <russ.haley@gmail.com> wrote: > > > On Mon, May 14, 2018 at 2:51 PM, Udit agarwal <dev.madaari@gmail.com> > wrote: > >> 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? >> > 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://81.4.107.225/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 >> 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. >> > > 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. :) > > >> Regards, >> Udit >> >> > >> > -- >> > Peter Jeremy >> > >> _______________________________________________ >> freebsd-arm@freebsd.org mailing list >> https://lists.freebsd.org/mailman/listinfo/freebsd-arm >> To unsubscribe, send any mail to "freebsd-arm-unsubscribe@freebsd.org" >> > >
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