[vfio-users] vfio, xeon e3s, acs, & gpus -- oh my!

[globalgorrilla at fastmail.fm]

On 3 Apr 2017, at 10:21, globalgorrilla at fastmail.fm wrote:

> On 3 Apr 2017, at 10:19, Steven Walter wrote:
>
>> On Mon, Apr 3, 2017 at 1:08 PM,  <globalgorrilla at fastmail.fm> wrote:
>>> On 2 Apr 2017, at 0:10, Joshua Hoblitt wrote:
>>>
>>>> I decided to go with an E6-1650 v4 / C612 based motherboard as I 
>>>> wanted
>>>> both ECC memory and a BMC.
>>>
>>>
>>> I think something this is the best option for the moment.
>>>
>>> Posted-interrupts are only on E5 v4 and Xeon-D.
>>>
>>> It makes a big difference with network cards (and GPUs).
>>>
>>> Does anyone know if AVIC or some other Ryzen feature provides for
>>> posted-interrupts?
>>
>> By "posted interrupts" do you mean that they get delivered directly 
>> to
>> the VM, bypassing the host?  If so, then yes enabling AVIC does
>> provide that behavior.  With AVIC enabled (kvm_amd.avic=1), I do not
>> see the counters in /proc/interrupts increment for passed-through
>> devices.
>
> Yes, that's it. Fantastic. Thanks!
>

This does make me interested in trying a Ryzen setup... the i7s AFAIK 
don't have posted-interrupts.