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

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209571

Jim Phillips <jim at ks.uiuc.edu> changed:

           What    |Removed                     |Added
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                 CC|                            |jim at ks.uiuc.edu

--- Comment #3 from Jim Phillips <jim at ks.uiuc.edu> ---
I'm going to post this as a separate issue, but will add it here since it is
related.  We were seeing non-NVMe SSDs on ZFS timing out on TRIM operations and
have been able to greatly reduce the incidence by setting (for all drives)
sysctl kern.cam.da.0.delete_max=536870912 based on the advice here:
https://lists.freebsd.org/pipermail/freebsd-scsi/2015-July/006777.html

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