Re: 2 second nvme initialization delay regression in 5.18 [Was: Re: [bug report]nvme0: Admin Cmd(0x6), I/O Error (sct 0x0 / sc 0x2) MORE DNR observed during blktests]

From: Pankaj Raghav
Date: Fri Jun 10 2022 - 08:06:04 EST

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In reply to: Christoph Hellwig: "Re: 2 second nvme initialization delay regression in 5.18 [Was: Re: [bug report]nvme0: Admin Cmd(0x6), I/O Error (sct 0x0 / sc 0x2) MORE DNR observed during blktests]"
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On Fri, Jun 10, 2022 at 08:14:49AM +0200, Christoph Hellwig wrote:
> The 970 seems to actually be very slightly newer than the X5. What
> I suspect is that they actually are the same m.2 SSD or at least a
> very similar one and Samsung decided to ship it in the thunderbolt
> attached versions first. Maybe one of the Samsung folks here can
> confirm.
>
> That leaves us with two plausible theories:
>
> - the problems could be due to an earlier firmware version or
> ASIC stepping
> - the problems are due to the thunderbolt attachment
>
I have forwarded this report internally within Samsung and I will post an
update once I have more information about this issue.

Cheers,
Pankaj