On Fri, 15 Apr 2016 11:44:43 +0300
Ivan Klymenko <fi...@ukr.net> wrote:

> On Thu, 14 Apr 2016 16:42:33 -0600
> Warner Losh <i...@bsdimp.com> wrote:
> 
> > The CAM I/O scheduler has been committed to current. This work is
> > described in
> > https://people.freebsd.org/~imp/bsdcan2015/iosched-v3.pdf though the
> > default scheduler doesn't change the default (old) behavior.
> > 
> > One possible issue, however, is that it also enables NCQ Trims on
> > ada SSDs. There are a few rogue drives that claim support for this
> > feature, but actually implement data corrupt instead of queued
> > trims. The list of known rogues is believed to be complete, but
> > some caution is in order.
> > 
> > Warner  
> 
> Hi.
> Thanks for you work.
> But i have problem with VirtualBox if i use the kernel with option
> CAM_NETFLIX_IOSCHED
> http://imgur.com/JpcfW1h

This problem is not over.
After the update on other hardware from r296979 to r298512 (!!! without
option CAM_NETFLIX_IOSCHED !!!) due to errors in recording the virtual
machine to a virtual disk I lost completely virtual machine with
permanent damage to the integrity of the file system in the inside of
the virtual machine.

This is a serious bug!

Who cares not to fall into the same situation - is testing yourself
and needed more testers.
Because there is a suspicion that the problem is also relevant for
bhyve VM.
With me on this no more neither the strength nor the desire nor
time.

Thanks.
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