[Bug 224080] ZFS: "arc_dnlc_evicts_thr" + "arc_reclaim_thread" - high CPU load during poudriere build...

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224080

--- Comment #27 from Cy Schubert <cy at FreeBSD.org> ---
Confirmed. The latest patch partially fixes the problem.

Mem: 186M Active, 60M Inact, 2123M Wired, 103M Buf, 2572M Free
ARC: 1012M Total, 368M MFU, 487M MRU, 11M Anon, 19M Header, 128M Other


On my sandbox machine (5 GB RAM) (lets call it machine 3 now).

bob<1># sysctl vm.kmem_map_free
vm.kmem_map_free: 1089998848
bob<1># sysctl vm.kmem_map_size
vm.kmem_map_size: 520613888
bob<1># sysctl hw.physmem 
hw.physmem: 5346369536
bob<1># 

bob# dtrace -n 'fbt::uma_reclaim_wakeup:entry { @[stack()] = count (); }'
dtrace: description 'fbt::uma_reclaim_wakeup:entry ' matched 1 probe

There is no output.

I'll get a chance to more fully test on on another machine (machine 2 before)
tonight. I've set up a test partition to boot from to allow for quick testing.

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