[Bug 211713] NVME controller failure: resetting

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211713

--- Comment #21 from Terry Kennedy <terry-freebsd at glaver.org> ---
(In reply to Warner Losh from comment #19)
It is a MZVPW128HEGM-00000 which is a SM961. This has happened in multiple
systems (identical hardware configs - see below) which otherwise are operating
flawlessly.

In previous correspondence with jimharris@, he had me try setting
hw.nvme.per_cpu_io_queues=0 which concealed the problem but resulted in abysmal
I/O performance (as expected). He also had me set some debug loader tunables
and post the results. Those are at https://www.glaver.org/transient/nvme

I just moved the card (SM961 on generic PCIe slot adapter) to a Dell PowerEdge
R710. It had been in a Supermicro X8DTH-iF. It works fine in the R710, even on
10.3-STABLE. Both of those systems are as similar as I could make them - both
use the Intel 5520 chipset, both have 2 * X5680 CPU, both have 48GB of RAM
(same part number in both systems). So it seems (at least in my case) to be
related to the system hardware.

I can try ordering some other M.2 NVMe module to see if this issue is specific
to the SM961, or if it is a problem with any NVMe on the X8DTH-iF board.

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