Very strange. I only tried it on my machine a few months with a crypto 
accelerator board and it worked completely perfectly once I got the command 
line syntax figured out. The board worked fine and produced the expected level 
of acceleration of crypto performance in my extensive load testing.

Perhaps if you tried making sure to deactivate the interfaces, and unload the 
igb module, as a temporary test, to be 100% sure it got fully unbound from the 
host OS it might help isolate the cause of the issue. I had the advantage that 
my host OS did not have an integrated driver so I couldn't experience as many 
resource conflicts as your environment. Can you also try another peripheral in 
the passthrough to see if that change the result as well?

Matthew.
-- 
Sent from my mobile device.

Stephan von Krawczynski <sk...@ithnet.com> wrote:
>On Sun, 18 Aug 2013 09:09:51 -0700
>Matthew Hall <mh...@mhcomputing.net> wrote:
>
>> You got it backwards. I am 99% sure they mean the VM needs to be set
>into the non default ICH9 mode. Probably because the other older
>chipset doesn't have VT-D on it.
>> -- 
>> Sent from my mobile device.
>
>You are right, but unfortunately it did not really help either.
>I switched the guest to ICH9, then I could pci-attach the two
>questionable
>network cards. The guest booted and everything looked fine, but did not
>work.
>The cards produced no interrupts at all. So I downed the guest and
>detached
>the devices - only to find out that the original driver (igb) didn't
>want them
>back... :-( (yes, I know how to bind via /sys)
>I had to reboot the host to get the networks back and during the
>shutdown vbox
>completely crashed and hung the box.
>After coldboot everything is back to normal now - without pciattached
>networks
>of course. I cannot recommend that to joe-average-user ...


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