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Subject: [Bug 212128] Default AIO settings break VirtualBox
Date: Thu, 25 Aug 2016 13:54:37 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D212128

Jan Bramkamp <crest@bultmann.eu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |crest@bultmann.eu

--- Comment #1 from Jan Bramkamp <crest@bultmann.eu> ---
In-flight AIO requests require kernel resources (threads, kernel memory),
because of this the kernel limits the concurrency. This sounds like Virtual=
Box
tries to issue too many AIO requests and ignores the errors. Just increasing
the limits to something that doesn't fail on your system with your workload
doesn't fix such a but. At best (or worst) it hides the bug. An application=
 is
expected to handle temporary AIO errors. Possible strategies include falling
back to synchronous IO, retrying the AIO with an exponential backoff or just
reporting the temporary error to the next layer.

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