Index: emulators/virtualbox-ose/pkg-message
===================================================================
--- emulators/virtualbox-ose/pkg-message	(revision 469728)
+++ emulators/virtualbox-ose/pkg-message	(working copy)
@@ -52,6 +52,13 @@
 If you experience "Network: write Failed: Cannot allocate memory" errors
 try to increase net.graph.maxdata in /boot/loader.conf
 
+If you using AIO then increase limits:
+vfs.aio.max_buf_aio=8192
+vfs.aio.max_aio_queue_per_proc=65536
+vfs.aio.max_aio_per_proc=8192
+vfs.aio.max_aio_queue=65536
+To check that AIO used use: kldstat -v | grep aio
+
 Check wiki page for known issues and troubleshooting:
 http://wiki.freebsd.org/VirtualBox