[Bug 212128] emulators/virtualbox-ose: Default AIO settings break VirtualBox

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212128

--- Comment #3 from rkoberman at gmail.com ---
I am now running with a more conservative set of AIO parameters and have had no
problems. N.B. I only run a single instance of Windows 7 or, on rare occasion,
Linux Mint, so this might not be appropriate for servers running multiple VMs
at the same time.

# From my sysctl.conf                    Default
vfs.aio.max_aio_procs=4                 # (32)
vfs.aio.aiod_lifetime=30000             # (3000)
vfs.aio.max_aio_queue=8192              # (1024)
vfs.aio.max_aio_queue_per_proc=1024     # (256)
vfs.aio.max_aio_per_proc=128            # (32)
vfs.aio.max_buf_aio=64                  # (16) 

I will shortly reduce these further and see how it goes.

This does not preclude the possibility that the modifications to the port could
fix this far batter, but I have not had an issue with either kernel memory or
error in the VMs with these adjustments.

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