https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224080
Bug ID: 224080
Summary: ZFS: "arc_dnlc_evicts_thr" + "arc_reclaim_thread" -
high CPU load during poudriere build...
Product: Base System
Version: CURRENT
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: n...@renzel.net
On 12-CURRENT r326527
Running a poudriere build results in high CPU load (up to 100%) for the ZFS
kernel threads "arc_dnlc_evicts_thr" and "arc_reclaim_thread":
------------------------------------------------------------------------------------------------
last pid: 8708; load averages: 5.53, 1.49, 0.55 up 0+00:01:05 14:09:07
787 processes: 18 running, 728 sleeping, 2 zombie, 39 waiting
Mem: 379M Active, 72M Inact, 765M Wired, 14G Free
ARC: 250M Total, 22M MFU, 178M MRU, 314K Anon, 6575K Header, 43M Other
100M Compressed, 292M Uncompressed, 2.91:1 Ratio
Swap: 32G Total, 32G Free
PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND
17 root -8 - 0K 192K CPU6 6 0:18 70.65%
zfskern{arc_dnlc_evicts_thr}
1328 root 52 0 14300K 5280K piperd 0 0:09 22.36% sh
11 root 155 ki31 0K 128K RUN 5 0:21 16.46% idle{idle:
cpu5}
11 root 155 ki31 0K 128K RUN 7 0:28 16.16% idle{idle:
cpu7}
11 root 155 ki31 0K 128K RUN 0 0:29 15.48% idle{idle:
cpu0}
11 root 155 ki31 0K 128K RUN 1 0:28 15.38% idle{idle:
cpu1}
17 root -8 - 0K 192K arc_re 1 0:09 14.79%
zfskern{arc_reclaim_thread}
11 root 155 ki31 0K 128K RUN 6 0:28 14.45% idle{idle:
cpu6}
11 root 155 ki31 0K 128K RUN 4 0:27 14.36% idle{idle:
cpu4}
11 root 155 ki31 0K 128K RUN 2 0:28 14.06% idle{idle:
cpu2}
11 root 155 ki31 0K 128K RUN 3 0:28 13.77% idle{idle:
cpu3}
1513 root 52 0 13024K 3968K nanslp 4 0:00 0.49% sh
15 root -16 - 0K 48K - 3 0:00 0.10% cam{doneq1}
0 root -16 - 0K 9024K swapin 4 0:28 0.00%
kernel{swapper}
0 root 8 - 0K 9024K - 3 0:00 0.00%
kernel{thread taskq}
12 root -96 - 0K 624K WAIT 5 0:00 0.00%
intr{irq281: hdac1}
12 root -60 - 0K 624K WAIT 0 0:00 0.00% intr{swi4:
clock (0)}
15 root -16 - 0K 48K - 6 0:00 0.00%
cam{scanner}
------------------------------------------------------------------------------------------------
I have 16GB of RAM and ARC is not limited - so there should be no memory
pressure.
That behaviour does not exist on 11-STABLE (r326088). There, both mentioned
threads only reaches about 1-2% at maximum (similar CPU).
Any ideas how to fix that?
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