Date: Thu, 13 Sep 2018 08:18:17 -0500 From: Eric van Gyzen <eric@vangyzen.net> To: freebsd-current <freebsd-current@freebsd.org>, markj@FreeBSD.org Subject: arc_reclaim_thread running hot Message-ID: <0cdba37f-6b47-0929-fb72-dcca7e70a05a@vangyzen.net>
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This morning, I found the arc_reclaim_thread running hot on my laptop
running 12.0-ALPHA5 r338572.
vfs.zfs.arc_max="4294967296" <-- 4 GiB
last pid: 13288; load averages: 1.32, 1.26, 1.16
Mem: 456M Active, 3837M Inact, 743M Laundry, 2563M Wired, 167M Free
ARC: 1131M Total, 304M MFU, 145M MRU, 1344K Anon, 9116K Header, 671M Other
89M Compressed, 361M Uncompressed, 4.03:1 Ratio
22 root -8 - 0 256K CPU2 2 309:20 99.75%
zfskern{arc_reclaim_thread}
zfs_arc_meta_strategy is still the default of 1.
I sampled the thread's stacks with
for N in `jot 1000`; do procstat -kk 100101; done | grep 100101
and put the results here:
https://people.freebsd.org/~vangyzen/arc_reclaim_thread_stacks.txt
I'm happy to help debug this. Just let me know what you need.
Eric
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