Limiting ZFS ARC Size?

[Bob Willcox]

Is there a way to limit the size of the ZFS ARC cache? I am running a
12-current system with 32GB of memory and the ZFS ARC grows to a hughe size,
to the point where my running processes (such as firefox) start page
thrashing.

***@tavion:13 /home/bob> uname -a
FreeBSD tavion.austin.ibm.com 12.0-CURRENT FreeBSD 12.0-CURRENT #3 r335222: Fri Jun 15 13:40:49 CDT 2018 ***@tavion.austin.ibm.com:/usr/obj/usr/src/amd64.amd64/sys/TAVION amd64

I would like to be able to limit how much memory ZFS grabs for this cache?

Thanks for any help/pointers!

Bob

[Frank Leonhardt]

Post by Bob Willcox
Is there a way to limit the size of the ZFS ARC cache? I am running a
12-current system with 32GB of memory and the ZFS ARC grows to a hughe size,
to the point where my running processes (such as firefox) start page
thrashing.

The sysctl variables vfs.zfs.arc_min and vfs.zfs.arc_max may very well
be what you're looking for.

Regards, Frank.

[Eric Wayte]

https://wiki.freebsd.org/ZFSTuningGuide

Post by Frank Leonhardt

Post by Bob Willcox
Is there a way to limit the size of the ZFS ARC cache? I am running a
12-current system with 32GB of memory and the ZFS ARC grows to a hughe size,
to the point where my running processes (such as firefox) start page
thrashing.

The sysctl variables vfs.zfs.arc_min and vfs.zfs.arc_max may very well
be what you're looking for.
Regards, Frank.
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