[PATCHv2 5/5] NVMe: Shutdown controller only for power-off

[Keith Busch]

On Sun, Jan 03, 2016 at 06:52:23PM +0200, Sagi Grimberg wrote:
> 
> >We don't need to shutdown a controller for a reset. A controller in a
> >shutdown state may take longer to become ready than one that was simply
> >disabled.
> 
> Just out of curiosity, what's "longer"? how much does this patch save us?

It depends on the device's capacity in my experience. Testing on a 2TB
P3700, a complete reset takes about 8 seconds when using controller
shutdown, and ~3 seconds without it.