[Bug 231457] Out of swap space on ZFS

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231457

Shane <FreeBSD at ShaneWare.Biz> changed:

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                 CC|                            |FreeBSD at ShaneWare.Biz

--- Comment #4 from Shane <FreeBSD at ShaneWare.Biz> ---
Actually, you don't have to use all your swap to get out of swap errors, they
also happen when too much ram is wired, this prevents any ram being swapped
in/out.

I started getting out of swap errors on 10.1 with 8G ram.

Look at "vm.stats.vm.v_wire_count * hw.page_size" at the time of getting out of
swap errors, this is the wired amount shown in top.

As I mentioned in bug #229764 max_wired is 30% so arc should be less than 70%
ram. Another thing that often wires ram is bhyve, so any guest ram should also
be considered when setting arc_max.

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