Date: Wed, 19 Jul 2023 11:34:14 -0700 From: Pete Wright <pete@nomadlogic.org> To: Scott Gasch <scott.gasch@gmail.com>, freebsd-questions <freebsd-questions@freebsd.org>, freebsd-hackers@freebsd.org Subject: Re: Swap filling up, usermode process swap usage doesn't explain Message-ID: <b24efee3-939b-3e20-d07f-8dad92d8e081@nomadlogic.org> In-Reply-To: <CABYAQkQftAfRXpdSJnqH2Hi=uD-dOiGWdFU8u1XqfeZNBUA35w@mail.gmail.com> References: <CABYAQkQftAfRXpdSJnqH2Hi=uD-dOiGWdFU8u1XqfeZNBUA35w@mail.gmail.com>
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On 7/19/23 07:49, Scott Gasch wrote:
> I am running a 13.2-RELEASE GENERIC kernel and seeing a pattern where,
> after about 10 days of uptime, my swap begins to fill up.
>
<snip>
>
> At least they agree about it being 11G. Is this kernel memory being
> paged out to swap? The machine has 128G of physical memory and isn't
> under very heavy load at the moment.
>
Are you running ZFS by any chance? If so its possible it is trying to
use as much memory as possible for the ARC. I've seen this on a few
systems which lots of memory. One way to tell is to run "top" and look
at the ARC stats:
last pid: 71322; load averages: 1.02, 0.94, 0.87 up
8+18:38:34 11:31:26
376 processes: 1 running, 146 sleeping, 229 zombie
CPU: 0.6% user, 0.0% nice, 6.5% system, 0.0% interrupt, 93.0% idle
Mem: 3599M Active, 18G Inact, 4132M Laundry, 4272M Wired, 892M Free
ARC: 1749M Total, 651M MFU, 239M MRU, 1864K Anon, 13M Header, 844M Other
216M Compressed, 758M Uncompressed, 3.52:1 Ratio
On a few of my larger memory systems I cap the ARC by setting this
sysctl knob (this is like 45G on my system):
vfs.zfs.arc.max=45000000000
-pete
--
Pete Wright
pete@nomadlogic.org
@nomadlogicLA
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