The disk performance monitor will not display statistics for devices with a major number greater than 255, e.g. NVMe disk devices (major number 259), even when said devices are available in /proc/diskstats / /proc/partitions. The plugin instead generates a "Device statistics unavailable" message.
As of this writing (2017-01-06 00:10 UTC), reproducible on the latest version available from Ubuntu packages (2.5.5-1), and the version on the git tree.
Probably caused by this: https://git.xfce.org/panel-plugins/xfce4-diskperf-plugin/tree/panel-plugin/devperf.c#n62
Created attachment 7010
Does it work if you try with this patch ?
(I of course dont have a linux to try it here)
Just tried the patch - it seems to be working with the patch applied.
(In reply to jlrdragon from comment #4)
> Just tried the patch - it seems to be working with the patch applied.
Great ! But most importantly, does it still work for disk devices where the major is < 255 ? Just want to make sure it doesnt regress...
It still reports stats for my /dev/sda, so, yes.
Thanks ! Applied in https://git.xfce.org/panel-plugins/xfce4-diskperf-plugin/commit/?id=a18919e4063f4f9c2947971d1c26fbf942a7a3c9 - should do a new release soonish.
*** Bug 13588 has been marked as a duplicate of this bug. ***