`nvme_disable_ctrl()` takes 411 ms on a Dell XPS 13 with SK hynix PC300 NVMEe

[Keith Busch]

On Wed, May 01, 2024 at 06:51:45AM +0200, Christoph Hellwig wrote:
> On Wed, May 01, 2024 at 06:29:12AM +0200, Paul Menzel wrote:
> > Could a warning be logged, when this takes more than 50 ms with a hint that 
> > the disk vendor should improve their firmware?
> 
> Not sure why we'd warn about it.  A clean shutdown can definitively take
> some time and there's nothing tha forbids it.  I don't think a linux
> message is going to have any effect on firmware engineering..

Exactly. Unless the device reports a lower D3 entry latency, then this
sounds like everything is working-as-designed.

You can check your device's advertised shutdown time (assuming your
device is nvme0):

  nvme id-ctrl /dev/nvme0 | grep rtd3e

The value is reported in microseconds. If it shows 0, then the device
doesn't report an expected shutdown time.