Hello,
20.11.2018 15:42, Lev Serebryakov пишет:
I have server which is mostly torrent box. It uses ZFS and equipped
with 16GiB of physical memory. It is running 11-STABLE (r339914 now).
I've updated it to r339914 from some 11.1-STABLE revision 3 weeks ago.
I was used to see 13-14GiB of memory in ZFS ARC and it was Ok.
Sometimes it "locks" under heavy disk load due to ARC memory pressure,
but it was bearable, and as ZFS is main reason this server exists, I
didn't limit ARC.
But new revision (r339914) shows very strange behaivor: ARC is no more
than 4GiB, but kernel has 15GiB wired:
Mem: 22M Active, 656M Inact, 62M Laundry, 15G Wired, 237M Free
ARC: 4252M Total, 2680M MFU, 907M MRU, 3680K Anon, 15M Header, 634M Other
2789M Compressed, 3126M Uncompressed, 1.12:1 Ratio
It is typical numbers for last week: 15G wired, 237M Free, but only
4252M ARC!
Where is other 11G of memory?!
[...]
And total USED/FREE numbers is very strange for me:
$ vmstat -z | tr : , | awk -F , '1{u+=$2*$4; f+=$2*$5} END{print u,f}'
5717965420 9328951088
$
So, only ~5.7G is used and 9.3G is free! But why this memory is not
used by ARC anymore and why is it wired and not free?
I'm getting pretty much same story on recent 11-STABLE from 9th
November. Previous versions didn't have that much questions about memory
usage (and I run several 11-STABLEs).
Eugene.
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