[Bug 209571] ZFS and NVMe performing poorly. TRIM requests stall I/O activity

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Tue Nov 28 22:31:44 UTC 2017


Warner Losh <imp at FreeBSD.org> changed:

           What    |Removed                     |Added
                 CC|                            |imp at FreeBSD.org

--- Comment #4 from Warner Losh <imp at FreeBSD.org> ---
nvd and nda have the opposite problem that da/ada have. ada/da collapse as many
BIO_DELETE commands down into a single TRIM to the device. That's why limiting
helps since huge trims take a long time.

nvd/nda, however, has the opposite problem. They do no trim collapsing at all,
so flood the device with TRIM requests that starve read/write requests.

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