And top(1) output after dropping caches:
top - 18:42:09 up 70 days, 18:18, 3 users, load average: 17.33, 22.19, 27.87
Tasks: 826 total, 2 running, 644 sleeping, 0 stopped, 0 zombie
%Cpu(s): 1.2 us, 22.9 sy, 0.0 ni, 63.3 id, 11.5 wa, 0.0 hi, 1.1 si, 0.0 st
GiB Mem : 125.805 total, 32.176 free, 91.669 used, 1.960 buff/cache
GiB Swap: 5.694 total, 5.688 free, 0.007 used. 33.172 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
13548 sarnold 20 0 9231484 8.695g 3836 S 340.8 6.9 96:59.86 rg
2 root 20 0 0 0 0 S 23.7 0.0 38:06.54 kthreadd
1523 root 20 0 0 0 0 S 16.4 0.0 419:11.17 arc_reclaim
8491 root 0 -20 0 0 0 R 14.8 0.0 5:56.88 z_rd_int_0
8494 root 0 -20 0 0 0 S 14.8 0.0 5:56.75 z_rd_int_3
8489 root 0 -20 0 0 0 S 14.5 0.0 6:52.34 z_null_int
8492 root 0 -20 0 0 0 S 14.5 0.0 5:56.99 z_rd_int_1
8498 root 0 -20 0 0 0 S 14.5 0.0 5:56.66 z_rd_int_6
8499 root 0 -20 0 0 0 S 14.5 0.0 5:56.71 z_rd_int_7
8493 root 0 -20 0 0 0 S 14.1 0.0 5:56.58 z_rd_int_2
8495 root 0 -20 0 0 0 S 14.1 0.0 5:56.75 z_rd_int_4
8497 root 0 -20 0 0 0 S 14.1 0.0 5:56.61 z_rd_int_5
1271 root 0 -20 0 0 0 D 11.2 0.0 18:28.48
spl_dynamic_tas
1531 root 39 19 0 0 0 S 10.5 0.0 21:26.74 dbuf_evict
1522 root 20 0 0 0 0 S 8.2 0.0 228:11.90 arc_prune
3790 root 0 -20 4520 1648 1556 S 6.6 0.0 13:23.43 atopacctd
6457 mirror 21 1 70928 30628 2976 D 5.6 0.0 0:44.18 rsync
30826 root 20 0 0 0 0 S 3.0 0.0 0:00.09 arc_prune
1272 root 0 -20 0 0 0 S 2.0 0.0 3:39.48
spl_kmem_cache
15868 root 20 0 0 0 0 S 1.0 0.0 0:00.03 arc_prune
16231 root 20 0 0 0 0 S 1.0 0.0 0:00.03 arc_prune
533 root 0 -20 0 0 0 I 0.7 0.0 1:38.82
kworker/3:1H
601 root 0 -20 0 0 0 I 0.7 0.0 1:37.84
kworker/21:1H
1530 root 20 0 0 0 0 S 0.7 0.0 7:11.37 dbu_evict
2116 root 20 0 0 0 0 I 0.7 0.0 0:18.64 kworker/1:1
4489 root 20 0 9916 848 664 S 0.7 0.0 6:18.54 rngd
7302 root 20 0 0 0 0 I 0.7 0.0 0:16.69 kworker/5:1
8952 root 20 0 0 0 0 I 0.7 0.0 0:22.74 kworker/2:2
12217 root 20 0 0 0 0 I 0.7 0.0 0:21.09
kworker/27:2
12258 sarnold 20 0 42620 4568 3256 R 0.7 0.0 0:00.42 top
16346 root 20 0 0 0 0 S 0.7 0.0 0:00.02 arc_prune
16394 root 20 0 0 0 0 S 0.7 0.0 0:00.02 arc_prune
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https://bugs.launchpad.net/bugs/1814983
Title:
zfs poor sustained read performance from ssd pool
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