[Bug 168298] VirtualBox using AIO on a zvol crashes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=168298

--- Comment #8 from rkoberman at gmail.com ---
I have done some experimentation and havebeen able to modify these settings to
less extreme values and still get VB to run without failing.
vfs.aio.max_aio_queue: 8192
vfs.aio.max_aio_queue_per_proc: 1024
vfs.aio.max_aio_per_proc: 128
vfs.aio.max_buf_aio: 64

I will admit that I have not tried tweaking these values for some time and I
suspect come are still allowing the consumption of more resources than needed,
but these are safer than those I first proposed.

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