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Date: Tue, 3 Apr 2018 21:45:13 -0700 (PDT)
From: Don Lewis <truckman@FreeBSD.org>
Subject: Re: Strange ARC/Swap/CPU on yesterday's -CURRENT
To: Cy Schubert <Cy.Schubert@cschubert.com>
cc: Larry Rosenman <ler@lerctr.org>, Bryan Drewery <bdrewery@FreeBSD.org>,
 Peter Jeremy <peter@rulingia.com>, Jeff Roberson <jroberson@jroberson.net>,
 FreeBSD current <freebsd-current@freebsd.org>,
 Andriy Gapon <avg@freebsd.org>
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On  3 Apr, Cy Schubert wrote:
> Try arbitrarily reducing arc_max through sysctl. ARC is immediately
> reduced and free memory increased however wired pages remains the
> same.

One thing that I've noticed is that with r329844 and earlier is that
there can be a difference of multiple GB between the ARC size and the
amount of wired memory.  With r329904 and newer the difference seems to
be pretty steady at 1 GB.