[Bug 211713] NVME controller failure: resetting

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

--- Comment #28 from Warner Losh <imp at FreeBSD.org> ---
OK. It isn't the SM961 generally. I have one in a NUC6 on my desk now (it
arrived last night). With 5 dd's reading it, I can get 2.5GB/s. More dd's don't
help. Data sheet says up to 3.1GB/s. But I'm seeing no errors with my card,
though it has AER reporting. I was able to newfs the 256GB version w/o issue.

I suspect, but cannot prove, this may be a signal issue causing errors. Linux
seems to cope better maybe? Or maybe it knows to push it less hard? Not sure. I
need to polish off the AER code I've written to monitor other devices I have.

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