Hi,
> On 23 Aug 2016, at 02:25, Kevin Oberman <[email protected]> wrote:
>
> On Mon, Aug 22, 2016 at 1:50 AM, Jan Mikkelsen <[email protected]
> <mailto:[email protected]>> wrote:
> Do you have aio loaded or compiled into your kernel? If so, does it keep
> happening without aio?
> [ … ]
> Thanks for the suggestion, but, no. This is on my trusty Lenovo T520 laptop
> and no aio to be found. My configuration is just:
> include GENERIC
> ident GENERIC_BSD4
>
> nooptions SCHED_ULE # ULE scheduler
> options SCHED_4BSD # 4BSD scheduler
>
> I still can't be sure if the problem was triggered by the move to VB 5 or t
> FreeBSD-11 (or a combination of both).
Yes, the problem could be in many places. However, if you’ve gone to FreeBSD
11, you have more aio than you think. From UPDATING:
20160301:
The AIO subsystem is now a standard part of the kernel. The
VFS_AIO kernel option and aio.ko kernel module have been removed.
Due to stability concerns, asynchronous I/O requests are only
permitted on sockets and raw disks by default. To enable
asynchronous I/O requests on all file types, set the
vfs.aio.enable_unsafe sysctl to a non-zero value.
Are you running the VM against a raw disk device? You can check the VBox.log
output — If you are not using aio, you should see an entry like this:
AIO: Async I/O manager not supported (rc=VERR_NOT_SUPPORTED). Falling back to
simple manager
If you are using AIO, you will should see entries like:
AIOMgr: Default manager type is "Async"
AIOMgr: Default file backend is “NonBuffered"
AIO issues were not a big issue for a long time but some recent updates to
4.3.something (or other environmental issues, possibly load) led me to turn aio
off on a bunch of 10.x machines running a significant number of VMs (~25). I’m
have been curious about whether the aio change would cause problems with an
upgrade to 11.
Regards,
Jan.
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