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Subject: [Bug 209571] ZFS and NVMe performing poorly. TRIM requests stall I/O
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Date: Tue, 28 Nov 2017 22:31:44 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D209571

Warner Losh <imp@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |imp@FreeBSD.org

--- Comment #4 from Warner Losh <imp@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 limit=
ing
helps since huge trims take a long time.

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

--=20
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