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Subject: [Bug 211713] NVME controller failure: resetting (Samsung SM961 SSD
 Drives)
Date: Tue, 11 Jul 2017 14:24:41 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D211713

--- Comment #33 from Terry Kennedy <terry-freebsd@glaver.org> ---
(In reply to Warner Losh from comment #32)

Back when I first ran into this, I sent Jim Harris a bunch of "sysctl
dev.nvme.0.ioq*.dump_debug=3D1" traces that he requested. He had me configu=
re the
driver with "hw.nvme.per_cpu_io_queues=3D0" which caused the card to work, =
but
also crippled performance.

I recently obtained an Optane 16GB NVMe stick, and that one does work in the
Supermicro board (where the PM961 didn't). I don't know if that proves
anything.

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