[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

Nick Evans <nevans at talkpoint.com> changed:

           What    |Removed                     |Added
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                 CC|                            |nevans at talkpoint.com

--- Comment #5 from Nick Evans <nevans at talkpoint.com> ---
Seeing the same on 11.0-RELEASE-p6 using a Samsung 960 EVO NVME. I've stopped
my (extremely slow) copy to the drive and this background traffic continues.

       tty            nvd0              da0              da1             cpu
 tin  tout  KB/t tps  MB/s   KB/t tps  MB/s   KB/t tps  MB/s  us ni sy in id
   0   150 32.00 456 14.25   0.00   0  0.00   0.00   0  0.00   0  0  0  0 100
   0   493 32.00 455 14.22   0.00   0  0.00   0.00   0  0.00   0  0  0  0 100
   0   151 32.00 454 14.18   0.00   0  0.00   0.00   0  0.00   0  0  0  0 100
   0   164 32.00 455 14.21   0.00   0  0.00   0.00   0  0.00   0  0  0  0 100

I've seen this on another system with Intel 750 PCIe cards but if I remember
right it seemed to handle the background trim better. It's been a while since I
tested it though. Both systems are test boxes so I can test any changes needed
and can move them to whatever base system versions are needed.

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