https://www.redhat.com/archives/dm-devel/2015-June/msg00042.html
https://www.redhat.com/archives/dm-devel/2015-June/msg00057.html Something is really really screwy here. Some stats are in ns, some are in ms: Index: linux-4.1-rc7/Documentation/device-mapper/statistics.txt =================================================================== --- linux-4.1-rc7.orig/Documentation/device-mapper/statistics.txt 2015-06-08 16:38:59.000000000 +0200 +++ linux-4.1-rc7/Documentation/device-mapper/statistics.txt 2015-06-08 17:00:05.000000000 +0200 @@ -13,9 +13,13 @@ the range specified. The I/O statistics counters for each step-sized area of a region are in the same format as /sys/block/*/stat or /proc/diskstats (see: Documentation/iostats.txt). But two extra counters (12 and 13) are -provided: total time spent reading and writing in milliseconds. All -these counters may be accessed by sending the @stats_print message to -the appropriate DM device via dmsetup. +provided: total time spent reading and writing. All these counters may +be accessed by sending the @stats_print message to the appropriate DM +device via dmsetup. + +The reported times are in milliseconds and the granularity depends on +the kernel ticks. When the option precise_timestamps is used, the +reported times are in nanoseconds. Each region has a corresponding unique identifier, which we call a region_id, that is assigned when the region is created. The region_id -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1790181 Title: /proc/diskstats shows weird values To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1790181/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
