Date: Tue, 20 Nov 2018 22:30:27 +0300 From: "Eugene M. Zheganin" <emz@norma.perm.ru> To: freebsd-fs@freebsd.org Cc: freebsd-stable@freebsd.org Subject: Re: Where is my memory on 'fresh' 11-STABLE? It should be used by ARC, but it is not used for it anymore. Message-ID: <29d0ab29-c967-ba5e-785e-5cb1ae670c8e@norma.perm.ru> In-Reply-To: <e2422965-0890-2d15-4716-0a31426b0a66@FreeBSD.org> References: <e2422965-0890-2d15-4716-0a31426b0a66@FreeBSD.org>
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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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