Can you try with the new barrier implementation in the [PATCH, RFC] relaxed barriers by making cache flushes just that and not complicated drain barrier it should speed this case up a lot. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html