https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216178
Bug ID: 216178
Summary: ZFS ARC and L2ARC are unrealistically large, maybe
after r307265
Product: Base System
Version: 11.0-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: l...@freebsd.org
I have two ZFS pools: one with single device (zroot) and one raidz with 5
devices (zstor). zstor has L2ARC of 185GB.
% zpool list -v
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH
ALTROOT
zroot 39.9G 13.7G 26.2G - 50% 34% 1.00x ONLINE -
gpt/root 39.9G 13.7G 26.2G - 50% 34%
zstor 13.6T 8.55T 5.08T - 22% 62% 1.00x ONLINE -
raidz1 13.6T 8.55T 5.08T - 22% 62%
ada1 - - - - - -
ada2 - - - - - -
ada3 - - - - - -
ada4 - - - - - -
ada5 - - - - - -
cache - - - - - -
gpt/l2arc 185G 185G 148M - 0% 99%
%
Both pools has compression enabled (lz4), but compression ratio on zstor is
negligible (it contains mostly media files, like music, films and RAW digital
photos). zroot has compression rate about 1.4:
% zfs get compressratio zroot zstor
NAME PROPERTY VALUE SOURCE
zroot compressratio 1.43x -
zstor compressratio 1.00x -
%
My system has 16GB of physical memory.
After upgrade to post-r307266 system (10-STABLE) different system tools starts
to show unrealistically large ARC. Upgrade to 11-STABLE (after r307265) doen't
help either. It looks like this:
(1) top output:
Mem: 195M Active, 4678M Inact, 9656M Wired, 1373M Free
ARC: 75G Total, 247M MFU, 6135M MRU, 1190K Anon, 77M Header, 556M Other
Swap: 8192M Total, 8192M Free
(2) zfs-stats -A output:
ARC Size: 515.61% 74.92 GiB
Target Size: (Adaptive) 100.00% 14.53 GiB
Min Size (Hard Limit): 12.50% 1.82 GiB
Max Size (High Water): 8:1 14.53 GiB
This starts after some uptime with disc activity (like buildworld & backup) and
could be reset to "normal" state with reboot only.
Sometimes, L2ARC starts to grow up to 400% of its size, too. L2ARC shows a lot
of checksum errors as it grow larger than physical size.
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