[Bug 228359] rebuild gmirror + ufs + ssd +trim

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228359

--- Comment #14 from Warner Losh <imp at FreeBSD.org> ---
(In reply to Kirk McKusick from comment #12)

We'll be plumbing this information up via GEOM soon. However, there's no way to
query. The different protocols have different maxes, and devices have different
sweet spots. The I/O scheduler might be able to measure the latter through
different techniques, with a fall back to sysctls to set the maximum size for
troublesome or awesome devices (down or up) depending...  It's not there yet. A
bigger issue is that we have no async interface to TRIM. This isn't a big deal
for SATA drives, as most of them can't do NCQ trim (and our support for NCQ
trim is limited to ahci), but for NVMe drives it can be a huge difference...

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