[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 #15 from Cy Schubert <cy at FreeBSD.org> ---
Machine 2, running buildworld -DNO_CLEAN and two rsyncs -- much better:

last pid:  4958;  load averages:  3.53,  1.93,  1.21    up 0+00:38:03  23:13:38
124 processes: 6 running, 118 sleeping
CPU:  1.9% user, 83.1% nice, 12.5% system,  0.0% interrupt,  2.6% idle
Mem: 1199M Active, 840M Inact, 44M Laundry, 5251M Wired, 81M Buf, 427M Free
ARC: 3059M Total, 639M MFU, 1797M MRU, 10M Anon, 52M Header, 561M Other
     1778M Compressed, 5101M Uncompressed, 2.87:1 Ratio
Swap: 12G Total, 12G Free

  PID USERNAME       THR PRI NICE   SIZE    RES STATE   C   TIME    WCPU COMMAN
 4847 root             1  90   10    98M 68872K RUN     3   0:03  91.98% cc
 4949 root             1  85   10 92972K 61428K RUN     0   0:01  62.55% cc
 3818 root             1  26    0   242M   234M select  2   0:02  17.95% rsync
 4945 root             1  52   10 10568K  1952K select  2   0:00   8.38% make
 4321 root             1  25    0   269M   261M select  1   0:01   7.72% rsync
 2639 cy               5  21    0 93388K 45296K CPU3    3   0:51   3.28% mate-t
 2581 root             1  22    0 69376K 46348K select  0   0:55   2.47% Xorg
 2855 cy              55  22    0  7866M   468M select  3   0:45   0.62% firefo
 4948 root             1  52   10 70348K 38172K wait    0   0:00   0.40% cc
 4825 root             1   4   10 11052K  2460K select  0   0:00   0.27% make
 3824 root             1  20    0 11004K  2504K sbwait  2   0:00   0.15% rsh
 3459 root             1  20    0 11040K  2656K select  0   0:00   0.14% moused
 4941 root             1  52   10 11732K  3196K wait    2   0:00   0.12% sh
 4944 root             1  52   10 11696K  3184K wait    3   0:00   0.12% sh
 3367 root             1  52   10 28328K 20252K select  1   0:01   0.11% make

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