Hi, On Wed, Apr 29, 2015 at 07:37:34PM +0800, Xuebing Wang wrote: > Hi Community, > > I am developing a commercial product based on Freescale iMX6, which supports > USB slave Mass Storage, command is: > modprobe g_mass_storage file=/dev/mmcblk0p4 > > (it is one partition in eMMC, this partition is formatted as FAT32) > (kernel version is 3.10.17, I did not try the latest mainline kernel) well, with such an old kernel, you're really on your own. > When connect device to Windows 7 host, performance is slow, it takes > 1.5 minutes to copy a 180MB file to mass storage slave. so here it takes 1.5 minutes. > But, on MacOS, it takes less than 15 minutes to copy the same 180MB > file. and here it takes 15 minutes ? IMO, your problem is with Mac OS X, not windows. > Did anyone experience the same issue? > > If this is still a known issue, I'd like to give this a try to improve > mass storage performance when connecting to Windows host. try setting nofua parameter. Windows always sets FUA bit (so all writes are *always* flushed to non-volatile media), but telling mass storage gadget to ignore FUA bit, you get better performance. -- balbi
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