https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247829
Bug ID: 247829
Summary: Constant load of 1 on a recent 12.1-STABLE with 3 ZFS
pools (high rates of zfskern{mmp_thread_enter})
Product: Base System
Version: 12.1-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: g...@freebsd.org
On a recent virtualized 12.1-STABLE build I see a constant load of 1. While
investigating 'top -HS' it shows a relative high cpu usage for
'zfskern{mmp_thread_enter}', like in the example below.
PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND
11 root 155 ki31 0B 64K CPU2 2 17:28 97.39% idle{idle:
cpu2}
11 root 155 ki31 0B 64K CPU3 3 17:29 96.78% idle{idle:
cpu3}
11 root 155 ki31 0B 64K CPU1 1 17:29 96.40% idle{idle:
cpu1}
11 root 155 ki31 0B 64K RUN 0 17:25 96.13% idle{idle:
cpu0}
8 root -8 - 0B 1040K mmp->m 2 0:44 4.32%
zfskern{mmp_thread_enter}
8 root -8 - 0B 1040K mmp->m 1 0:44 4.28%
zfskern{mmp_thread_enter}
8 root -8 - 0B 1040K mmp->m 3 0:44 4.25%
zfskern{mmp_thread_enter}
The problem at this point is that the relatively small CPU usage results in a
load=1.0, which let the host system schedule the assigned CPU cores of the VM
at the highest possible clockrate.
Trying OpenZFS seems to improve the situation, but I am not sure that this is
completely true, since only my zroot pool was detected and the two other pools
weren't.
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