NVMe Tuning

[Redbeard]

@Arwin

First, do you have a NVMe on your 9 year old X86 desktop?

Yes.  I have an Intel 660p Series M.2 2280 1TB PCIe NVMe mounted in an adapter in a free PCIe slot.

Second, did you run the command, "sudo nvme id-ctrl /dev/nvme0", to get the power settings of your NVMe?

My desktop has 2 NVMe SSD drives, and only 1 has the ability to change it's power settings. The other does not. Thus, it would likely fail like yours.

Yes.  When I run "sudo nvme id-ctrl /dev/nvme0" it comes back with the following power settings:

ps    0 : mp:4.00W operational enlat:0 exlat:0 rrt:0 rrl:0
          rwt:0 rwl:0 idle_power:- active_power:-
ps    1 : mp:3.00W operational enlat:0 exlat:0 rrt:1 rrl:1
          rwt:1 rwl:1 idle_power:- active_power:-
ps    2 : mp:2.20W operational enlat:0 exlat:0 rrt:2 rrl:2
          rwt:2 rwl:2 idle_power:- active_power:-
ps    3 : mp:0.0300W non-operational enlat:5000 exlat:5000 rrt:3 rrl:3
          rwt:3 rwl:3 idle_power:- active_power:-
ps    4 : mp:0.0040W non-operational enlat:5000 exlat:9000 rrt:4 rrl:4
          rwt:4 rwl:4 idle_power:- active_power:-

What is strange is I can set the power value, so long as I don't use the -s option.  I've replaced my user name and my path at the terminal with "#############?" below: 

#############? sudo nvme set-feature /dev/nvme0 -f 2 -v 2
set-feature:02 (Power Management), value:0x000002
#############? sudo nvme get-feature /dev/nvme0 -f 2
get-feature:0x2 (Power Management), Current value:0x000002
#############? sudo nvme set-feature /dev/nvme0 -f 2 -v 2 -s
NVMe Status:FEATURE_NOT_SAVEABLE(10d)

As I noted above, this isn't really an issue for me.  But it did throw me off a bit.