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

[bugzilla-noreply at freebsd.org]

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

--- Comment #30 from Cy Schubert <cy at FreeBSD.org> ---
With r326347 removed and kern_size, kern_size_max and arc_max tunables removed
from loader.conf:

Laptop w 8 GB with two processes each of tar of /usr/src and /usr/obj and
buildworld/buildkernel -DNO_CLEAN and firefox:

CPU:  2.7% user, 95.0% nice,  2.1% system,  0.1% interrupt,  0.0% idle
Mem: 617M Active, 67M Inact, 204M Laundry, 6505M Wired, 144M Buf, 369M Free
ARC: 4879M Total, 1830M MFU, 2630M MRU, 21M Anon, 54M Header, 343M Other
     3983M Compressed, 10G Uncompressed, 2.69:1 Ratio
Swap: 12G Total, 382M Used, 12G Free, 3% Inuse, 128K In

slippy$ sysctl vm.kmem_size    
vm.kmem_size: 8138752000
slippy$ sysctl vm.kmem_size_max
vm.kmem_size_max: 1319413950874
slippy$ sysctl hw.physmem
hw.physmem: 8365899776
slippy$ sysctl vfs.zfs.arc_max 
vfs.zfs.arc_max: 7065010176
slippy$ 


Server machine in basement with 8 GB also running two processes each of tar of
/usr/src and /usr/obj and buildworld/buildkernel -DNO_CLEAN, no firefox:

CPU:  0.0% user, 97.0% nice,  2.6% system,  0.4% interrupt,  0.0% idle
Mem: 257M Active, 246M Inact, 36K Laundry, 6690M Wired, 110M Buf, 746M Free
ARC: 5153M Total, 1262M MFU, 3472M MRU, 20M Anon, 53M Header, 346M Other
     4364M Compressed, 11G Uncompressed, 2.51:1 Ratio
Swap: 20G Total, 95M Used, 20G Free

cwsys$ sysctl vm.kmem_size    
vm.kmem_size: 8325844992
cwsys$ sysctl vm.kmem_size_max
vm.kmem_size_max: 1319413950874
cwsys$ sysctl hw.physmem
hw.physmem: 8566390784
cwsys$ sysctl vfs.zfs.arc_max  
vfs.zfs.arc_max: 7252103168
cwsys$ 

This is also with additional patch discussed in comment #26 removed.

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