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. :-) 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
