Hi, On 12/18/2015 06:49 AM, Ulf Hansson wrote: > On 17 December 2015 at 20:47, Alan Cooper <alcooperx@xxxxxxxxx> wrote: >> On Wed, Dec 16, 2015 at 4:07 AM, Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote: >>> To find the improved card detection times, I just used the kernel boot >>> log and checked the time stamps for when the cards get detected. I ran >>> the tests ~10 times and picked up some average values. >>> >>> To notice the improvement you need at least two cards to be inserted >>> during boot. Perhaps you have a platform with one eMMC and one SD card >>> slot, you can test. >> >> I tested the patch on one of our ARM bases SoC's. The SoC has an SD >> card slot on the first controller and an eMMC device on the second >> controller. I found ~100ms improvement on the time it took for the >> rootfs on the eMMC device to be ready for use. Interestingly, I did >> see the SD/eMMC order swap once in 20 tries. This is not an issue for >> us as we already have to use UUID for the eMMC rootfs in case an SD >> card is installed. >> >> Al > > Al, thanks for your effort in testing. I assume I can apply a > tested-by tag for that! > > BTW, if you want to see an even better improvement, just find a > crappier SD card as I guess you have a quite good one. :-) I didn't test with this yet..actually, i have tested with only one board(Exynos4412). There is no the changing index. (Not too much for testing) but in my experiment, our platform(Tizen) should be produced the problem in SD-card case. I need to check with SystemFW guys. I will check this..ASAP. Best Regards, Jaehoon Chung > > Kind regards > Uffe > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
