Re: [PATCH RFC] PCI: Start the reset of WD PC SN730 NVMe controllers early

[sashiko-bot@kernel.org]

> [Please consider this a bug report.]
> 
> On a Dell XPS 13 9310 (BIOS 3.17.0) with a WD PC SN730 1 TB (15b7:5006,
> firmware 11170012, the newest available for this OEM drive), about one
> boot in ten mounts the root file system 100 to 700 ms late. With the
> nvme module probing at 0.29 s from a small initrd, the time from probe
> to Identify grows from 9 ms to 74 to 229 ms, and the partition table
> read and the mount get slower too:
> 
>     nvme nvme0: pci function 0000:01:00.0                 [0.293894]
>     nvme nvme0: passthrough uses implicit buffer lengths   [0.522525]  (+228.6 ms, usually +9 ms)
>      nvme0n1: p1 p2 p3 p4                                   +27.3 ms  (usually 3 ms)
>     EXT4-fs (nvme0n1p3): mounted filesystem                 +82.2 ms  (usually 8 ms)
> 
> Tracing nvme_disable_ctrl() and nvme_enable_ctrl() with function_graph
> [ ... ]
> 
> That boot was not traced, so whether the reset outlasted the 100 ms head
> start or the enable was slow is unknown.
> 
> Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>

Sashiko has reviewed this patch and found no issues.

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