linux-kernel - 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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Date:   Fri, 10 Jun 2022 14:05:54 +0200
From:   Pankaj Raghav <pankydev8@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        "R, Monish Kumar" <monish.kumar.r@...el.com>,
        "open list:NVM EXPRESS DRIVER" <linux-nvme@...ts.infradead.org>,
        Sagi Grimberg <sagi@...mberg.me>,
        "alan.adamson@...cle.com" <alan.adamson@...cle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Yi Zhang <yi.zhang@...hat.com>,
        Keith Busch <kbusch@...nel.org>, "axboe@...com" <axboe@...com>,
        "Rao, Abhijeet" <abhijeet.rao@...el.com>,
        Pankaj Raghav <p.raghav@...sung.com>,
        Javier González <javier.gonz@...sung.com>
Subject: 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]

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