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From: Joseph Mingrone <jrm@ftfl.ca>
Subject: Re: memory exhaustion on 10.1 AMD64 ZFS storage system
Date: Tue, 13 Jan 2015 11:35:05 -0400
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Mark Martinec <Mark.Martinec+freebsd@ijs.si> writes:
> Aggressiveness of ARC in 10.0 hurt us pretty badly when switching from
> 9.2 to 10.0.  The ARC / UMA greediness for memory was causing excessive
> swapping out of still active processes, while keeping ARC luxuriously
> bathing in memory. The situation in 10.1 may have been slightly improved,
> although it seems the fix still has not been committed:
>
> Bug 187594 - [zfs] [patch] ZFS ARC behavior problem and fix
>   https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=187594
>
> I'd really like to see a solution committed in time for 10.2.

I've set vfs.zfs.arc_max=24G.  That leaves 8 GB for everything else.
Hopefully that helps.

Thanks,

Joseph