Re: [Xen-devel] AMD Radeon 7970 passthrough on XEN 4.4.3 with an AMD FX-8350/Gigabyte GA-970A-UD3 *HORROR*

["NiX" <nix@xxxxxxxxxxxxxxxx>]

> Hello,
>
> On Sat, Sep 19, 2015 at 08:21:15PM +0300, NiX wrote:
>> After a lot of trial and error I got it working as a secondary
>> pass-through. Thanks mainly to bullshit examples around the net. None
>> seem
>> to know nothing.
>>
>> I though of I am the idiot but I was wrong.
>>
>
> GPU passthru isn't very simple or straight-forward unfortunately..

I did not expected it to be simple. I upgraded that VM to Win10 and there
is less horror. It works and runs the game with as good FPS as on Win7
bare metal.

>
>
>> Whole system crashes upon shutting down the VM that had the adapter
>> passed
>> through. This actually screw up whole pass-through feature. Do that
>> crash
>> happen because 7970 does not have device reset feature or whatever it
>> was
>> called?
>>

This issue occur also on Win10 though the upgrade fixed all the other
issues I encountered.

>
> Do you happen to have a serial console available, so you could capture the
> crash/error messages from Xen and/or dom0 Linux kernel?
>
> SOL (Serial-Over-LAN) works too, if you have Intel AMT, IPMI, or other
> BMC..
>

Not regular MB's such the one mentioned in the topic has such a feature.

PS. Is not XEN-DEVEL team able to code in XEN kernel such feature it
captures kernel log somewhere before panic occurs or whatever the reason
is? It is loading before actual kernel so I think it is possible.


>
>> I got it working only few times and Battlefield 4 started and ran
>> actually
>> surprisingly good at 50+ FPS with maxed details at 1600:900 on AMD 7970.
>>
>> However the next day immediately after when I attempt to login to VM
>> screen goes blank and whole system crashes (power off is required to
>> restore). It is also significantly lagged. ie. typing the password has
>> around 1 second delay per letter.
>>
>> This is unacceptable issue. Anyone else experienced the same horror?
>>
>> Thanks anyway for providing XEN but there are a lot to be fixed ...
>>
>> I've no issues on that VM when I don't use pass-through expect a
>> significantly high CPU usage in HVM mode when I start using the computer
>> say IE 11 browser. All cores have a 30-50% CPU usage when I do a small
>> tasks such as windows udpate etc.
>>
>
> How do you use the VM? I hope using RDP over the network..
>
>
>> PS. That VM image is on Samsung 840 PRO SSD and it was loading the game
>> really fast when it worked.
>>
>> There was no difference to the issue wheter or not CCC was installed.
>
>
> -- Pasi
>
>



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