Hello Jonathan, I've been doing some digging around the diskstats code and there is something which bothers me. The 11th field is described as: " Field 11 -- weighted # of milliseconds spent doing I/Os This field is incremented at each I/O start, I/O completion, I/O merge, or read of these stats by the number of I/Os in progress (field 9) times the number of milliseconds spent doing I/O since the last update of this field. This can provide an easy measure of both I/O completion time and the backlog that may be accumulating. " The actual code which prints the number there is using jiffies_to_msecs(part_stat_read(hd, time_in_queue). Which is the same code responsible for /sys/block/<dev>/stat's last number. So I think the documentation is wrong regarding the semantics of the 11th field. Maybe it would be a good idea to get this updated? Regards, Nikolay -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
