[Bug 229670] Too many vnodes causes ZFS ARC to exceed limit vfs.zfs.arc_max (high ARC "Other" usage)

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229670

--- Comment #16 from Leif Pedersen <leif at ofWilsonCreek.com> ---
After upgrading to 12 and letting a backup cycle run, it seems to be behaving
well with defaults. I will try to aggravate the system a bit and see if it'll
run over.

Showing the good behavior currently:

$ top
last pid: 11816;  load averages:  0.11,  0.17,  0.19                           
                                                                               
                                                                               
                                                    up 0+22:17:27  23:13:17
40 processes:  1 running, 39 sleeping
CPU:  0.0% user,  0.0% nice,  0.8% system,  0.4% interrupt, 98.9% idle
Mem: 21M Active, 242M Inact, 3365M Wired, 2266M Free
ARC: 736M Total, 204M MFU, 186M MRU, 1120K Anon, 20M Header, 325M Other
     198M Compressed, 713M Uncompressed, 3.60:1 Ratio
Swap: 46G Total, 46G Free

$ sysctl vfs.zfs.arc_max kstat.zfs.misc.arcstats.other_size
kstat.zfs.misc.arcstats.bonus_size kstat.zfs.misc.arcstats.dnode_size
kstat.zfs.misc.arcstats.dbuf_size kstat.zfs.misc.arcstats.metadata_size
vfs.zfs.arc_max: 795202560
kstat.zfs.misc.arcstats.other_size: 340702560
kstat.zfs.misc.arcstats.bonus_size: 83656640
kstat.zfs.misc.arcstats.dnode_size: 191070880
kstat.zfs.misc.arcstats.dbuf_size: 65975040
kstat.zfs.misc.arcstats.metadata_size: 401358848

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