https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274698
Bug ID: 274698
Summary: arc_prune consuming 100% CPU
Product: Base System
Version: 15.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: ma...@freebsd.org
CC: m...@freebsd.org
In the past couple of months I see a new problem: ZFS' arc_prune thread will
occasionally start consuming a CPU and run for hours. Looking at "vmstat -z |
grep taskq", I can see that a huge number of task allocations are pending, and
they are slowly draining.
It looks like back-to-back calls to arc_evict() can queue up a silly amount of
work. The Linux implementation of arc_prune_async() is careful to avoid this
problem.
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