Hi, I've run into a huge performance gap between running a g_mass_storage gadget with the backing file pointing to a raw partition (/dev/mmcblk1) vs. creating a file on an ext4 filesystem and exporting that. With the partition I see write rates around 5MB/s, and with /proc/sys/vm/block_dump enabled I can see that all writes are 512-byte single-sector writes. Using a file within ext4fs, I get around 20MB and block_dump shows large IOs (mostly 2048 sector). Is there any way to get raw-partition to better use caching and not write back every sector individually? Thanks, mh -- Martin Hicks P.Eng. | mort@xxxxxxxx Bork Consulting Inc. | +1 (613) 266-2296 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
