[Bug 224080] ZFS: "arc_dnlc_evicts_thr" + "arc_reclaim_thread" - high CPU load during poudriere build...

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224080

--- Comment #16 from Cy Schubert <cy at FreeBSD.org> ---
I've done some testing with r326347 reverted and with r326346 + r326347
reverted. My test included I/O intensive operations including
buildworld/buildkernel -DNO_CLEAN and parallel rsync. Removing r326346 +
r326347 showed no significant improvement over removal of only r326347 (below).
r326347 definitely caused the issue. Note MFU. Performance is significantly
better due to improved ARC caching.

last pid:  2156;  load averages:  2.56,  2.32,  1.66    up 0+00:25:52  00:32:57
89 processes:  4 running, 85 sleeping
CPU:  1.3% user, 75.8% nice, 20.5% system,  0.8% interrupt,  1.7% idle
Mem: 390M Active, 602M Inact, 5631M Wired, 63M Buf, 1317M Free
ARC: 3585M Total, 1106M MFU, 2029M MRU, 14M Anon, 60M Header, 376M Other
     2734M Compressed, 6084M Uncompressed, 2.23:1 Ratio
Swap: 20G Total, 20G Free

  PID USERNAME       THR PRI NICE   SIZE    RES STATE   C   TIME    WCPU COMMAN
63633 root             1  52    0 36720K 27164K RUN     1   2:28   7.38% pkg
 2136 root             1   4   10 10548K  1932K select  0   0:00   6.32% make
 1909 root             1   4   10 11808K  3144K select  1   0:00   0.36% make
 2096 root             1  24    0 13804K  3952K CPU1    1   0:00   0.11% top
 2135 root             1  52   10 11700K  3124K wait    1   0:00   0.11% sh
 3598 root             1  20    0 14312K  5216K select  0   0:02   0.10% screen
98994 root             1   4   10 28516K 20320K select  1   0:01   0.10% make
 1828 root             1  52   10 10404K  1608K select  1   0:00   0.07% make
61839 root             1  30   10 10196K  1324K select  1   0:00   0.05% make
 1906 root             1   4   10 10360K  1468K select  1   0:00   0.05% make
98907 root             1  30   10 10980K  2340K select  1   0:00   0.04% make
99013 root             1  30   10 23784K 15508K select  1   0:00   0.04% make
 2712 root             1  20    0 14352K  5624K select  1   0:00   0.02% devd
 3137 root             1  20    0 10860K  2456K select  0   0:00   0.01% powerd

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