This is also repeatable on my pool of slower spinning metal disks, srv:
top - 22:59:43 up 71 days, 22:35, 3 users, load average: 18.88, 17.98, 10.68
Tasks: 804 total, 20 running, 605 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.1 us, 58.0 sy, 0.0 ni, 41.9 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 13191572+total, 14715308 free, 11000072+used, 7199696 buff/cache
KiB Swap: 5970940 total, 5950460 free, 20480 used. 20842640 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1523 root 20 0 0 0 0 R 98.3 0.0 512:59.56 arc_reclaim
11330 root 20 0 0 0 0 R 57.1 0.0 0:04.91 arc_prune
11388 root 20 0 0 0 0 S 57.1 0.0 0:02.48 arc_prune
1522 root 20 0 0 0 0 R 56.8 0.0 282:45.37 arc_prune
11259 root 20 0 0 0 0 S 56.8 0.0 0:08.04 arc_prune
11323 root 20 0 0 0 0 R 56.8 0.0 0:05.20 arc_prune
11395 root 20 0 0 0 0 R 56.8 0.0 0:02.23 arc_prune
11400 root 20 0 0 0 0 S 56.8 0.0 0:01.96 arc_prune
11350 root 20 0 0 0 0 R 56.1 0.0 0:03.92 arc_prune
11375 root 20 0 0 0 0 S 56.1 0.0 0:02.86 arc_prune
11373 root 20 0 0 0 0 S 55.8 0.0 0:02.91 arc_prune
11379 root 20 0 0 0 0 S 55.1 0.0 0:02.65 arc_prune
11396 root 20 0 0 0 0 R 54.8 0.0 0:02.06 arc_prune
11378 root 20 0 0 0 0 R 54.5 0.0 0:02.67 arc_prune
11399 root 20 0 0 0 0 R 54.1 0.0 0:01.92 arc_prune
11406 root 20 0 0 0 0 R 54.1 0.0 0:01.68 arc_prune
11407 root 20 0 0 0 0 R 52.5 0.0 0:01.59 arc_prune
11409 root 20 0 0 0 0 R 46.5 0.0 0:01.41 arc_prune
11410 root 20 0 0 0 0 S 45.9 0.0 0:01.39 arc_prune
11417 root 20 0 0 0 0 S 40.3 0.0 0:01.22 arc_prune
11421 root 20 0 0 0 0 R 36.3 0.0 0:01.10 arc_prune
11424 root 20 0 0 0 0 S 32.7 0.0 0:00.99 arc_prune
11428 root 20 0 0 0 0 R 28.4 0.0 0:00.86 arc_prune
11429 root 20 0 0 0 0 S 27.4 0.0 0:00.83 arc_prune
11430 root 20 0 0 0 0 S 22.8 0.0 0:00.69 arc_prune
11433 root 20 0 0 0 0 S 20.1 0.0 0:00.61 arc_prune
11434 root 20 0 0 0 0 R 17.5 0.0 0:00.53 arc_prune
11439 root 20 0 0 0 0 R 11.2 0.0 0:00.34 arc_prune
11440 root 20 0 0 0 0 R 10.2 0.0 0:00.31 arc_prune
11442 root 20 0 0 0 0 S 6.6 0.0 0:00.20 arc_prune
11445 root 20 0 0 0 0 R 3.0 0.0 0:00.09 arc_prune
8021 sarnold 20 0 58756 19168 4792 D 1.7 0.0 0:03.33 dpkg-source
11446 root 20 0 0 0 0 R 1.7 0.0 0:00.05 arc_prune
sarnold@wopr:/tmp$ sudo -s
[sudo] password for sarnold:
root@wopr:/tmp# echo 3 > /proc/sys/vm/drop_caches
top - 23:01:37 up 71 days, 22:37, 3 users, load average: 6.43, 14.26, 10.22
Tasks: 823 total, 2 running, 637 sleeping, 0 stopped, 0 zombie
%Cpu(s): 1.3 us, 4.7 sy, 0.0 ni, 93.3 id, 0.5 wa, 0.0 hi, 0.1 si, 0.0 st
KiB Mem : 13191572+total, 11750942+free, 14105432 used, 300868 buff/cache
KiB Swap: 5970940 total, 5950460 free, 20480 used. 11703465+avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
5021 sarnold 20 0 30492 10356 5612 S 10.2 0.0 0:03.16 unpack.py
29956 sarnold 20 0 50232 16696 4832 R 3.0 0.0 0:00.09 dpkg-source
8511 root 1 -19 0 0 0 S 2.3 0.0 14:36.23 z_wr_iss
8515 root 1 -19 0 0 0 S 2.3 0.0 14:37.99 z_wr_iss
8516 root 1 -19 0 0 0 S 2.3 0.0 14:36.83 z_wr_iss
8517 root 1 -19 0 0 0 S 2.3 0.0 14:36.77 z_wr_iss
8520 root 1 -19 0 0 0 S 2.3 0.0 14:36.52 z_wr_iss
8523 root 1 -19 0 0 0 S 2.3 0.0 14:37.16 z_wr_iss
8500 root 1 -19 0 0 0 S 2.0 0.0 14:37.04 z_wr_iss
8501 root 1 -19 0 0 0 S 2.0 0.0 14:36.62 z_wr_iss
8504 root 1 -19 0 0 0 S 2.0 0.0 14:36.89 z_wr_iss
8505 root 1 -19 0 0 0 S 2.0 0.0 14:36.22 z_wr_iss
8507 root 1 -19 0 0 0 S 2.0 0.0 14:37.31 z_wr_iss
8508 root 1 -19 0 0 0 S 2.0 0.0 14:36.84 z_wr_iss
8509 root 1 -19 0 0 0 S 2.0 0.0 14:36.55 z_wr_iss
8512 root 1 -19 0 0 0 S 2.0 0.0 14:37.00 z_wr_iss
8514 root 1 -19 0 0 0 S 2.0 0.0 14:36.59 z_wr_iss
8518 root 1 -19 0 0 0 S 2.0 0.0 14:36.75 z_wr_iss
8521 root 1 -19 0 0 0 S 2.0 0.0 14:36.21 z_wr_iss
8522 root 1 -19 0 0 0 S 2.0 0.0 14:36.66 z_wr_iss
2 root 20 0 0 0 0 S 1.6 0.0 48:17.74 kthreadd
1531 root 39 19 0 0 0 S 1.6 0.0 26:38.12 dbuf_evict
8502 root 1 -19 0 0 0 S 1.6 0.0 14:36.83 z_wr_iss
8506 root 1 -19 0 0 0 S 1.6 0.0 14:37.19 z_wr_iss
8510 root 1 -19 0 0 0 S 1.6 0.0 14:37.02 z_wr_iss
8513 root 1 -19 0 0 0 S 1.6 0.0 14:37.31 z_wr_iss
8519 root 1 -19 0 0 0 S 1.6 0.0 14:37.35 z_wr_iss
8489 root 0 -20 0 0 0 S 1.3 0.0 13:52.77 z_null_int
8503 root 1 -19 0 0 0 S 1.3 0.0 14:36.46 z_wr_iss
1271 root 0 -20 0 0 0 S 1.0 0.0 23:33.65
spl_dynamic_tas
2287 root 20 0 42620 4628 3188 R 1.0 0.0 0:00.44 top
8491 root 0 -20 0 0 0 S 1.0 0.0 11:57.43 z_rd_int_0
8525 root 0 -20 0 0 0 S 1.0 0.0 5:44.43 z_wr_int_0
readops on the srv pool jumped from roughly 40 to roughly 2k, before settling
down again around 500-1000 riops.
Thanks
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https://bugs.launchpad.net/bugs/1814983
Title:
zfs poor sustained read performance from ssd pool
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