https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236510
Bug ID: 236510
Summary: ZFS ARC usage causes mlock(2) to fail with EAGAIN
Product: Base System
Version: 11.2-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: mar...@lispworks.com
Attachment #202843 text/plain
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Created attachment 202843
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mlocktest.c
I am running 11.2-p5.
With the default settings of vm.max_wired and vfs.zfs.arc_max, compile and run
the attached mlocktest.c on a ZFS filer where ARC is using more than 1/3 of
RAM. It is very likely to fail with
mlocktest: mlock: Resource temporarily unavailable
Other examples are gpg and pinentry-tty which will complain about using
insecure memory.
The problem is that mlock(2) fails when vm.stats.vm.v_wire_count >
vm.max_wired. This is fine when there is little else using wired memory, but
ZFS ARC seems to be a large user of it. Of course vfs.zfs.arc_max could be
decreased or vm.max_wired could be increased, but this doesn't seem sensible on
a ZFS file server that only needs a small amount of mlock'ed memory.
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