On 17 July 2014 14:15, Clemens Eisserer <linuxhippy@xxxxxxxxx> wrote: > Hi again, > > Is this the wrong mailing list to ask about throughput issues with > linux card reader drivers in general? > If it is not, please point me to the right list. This is the right list, I guess people have been busy. :-) I would as as few initial steps do the following: 1) Check the kernel log once the card is inserted to see what type of card it is detected as. 2) There are a debugfs directory corresponding to each card and host. There you can find out what bus mode/width the card is operating in as well as the current bus frequency. 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