[vfio-users] posted interrupts

[Joshua Lee]

I saw it online somewhere, but forgot the kernel parameter... I'll try to
find it, and anything else you might need to know.

On Thu, Apr 6, 2017 at 5:00 PM, P. Pronk <vfio at pronk.nl> wrote:

>
> not sure which kernel parameter or libvirt option that would be either
> unfortunately.
>
> If you or someone else can point to some clear directions I am still happy
> to help.
>
> On 06/04/17 20:06, Joshua Lee wrote:
>
> If you get that running, run FIrestrike both "before and after" using
> posted interrupts for me... and show what scores you get, maybe some other
> benchmark like one of the ones from Unigine if you have the time.
>
> On Thu, Apr 6, 2017 at 1:00 PM, Joshua Lee <joshua613 at gmail.com> wrote:
>
>> I'm not sure, I know there's a kernel command line argument that
>> activates support for it, then there might be something also within your
>> libvirt XML and QEMU command-line?
>>
>> On Thu, Apr 6, 2017 at 8:00 AM, P. Pronk <vfio at pronk.nl> wrote:
>>
>>>
>>> With regards to your first question, I am using an E5-1620v4 with X99
>>> chipset but I am not sure how I can check for you if the 16xx supports
>>> this. Let me know if you would like me to check something specifically.
>>>
>>> Kind regards, Pim
>>>
>>> On 06/04/17 13:18, Joshua Lee wrote:
>>>
>>> I'm not clear if posted interrupts, a feature of Broadwell-EP, is
>>> available on both E5 1xxx V4 and E5 2xxx V4, or just E5 2xxx V4? Intel's
>>> marketing literature seems to stress the latter family of processors as
>>> having it, but reviews on sources such as Anandtech do not mention anything
>>> but Broadwell-EP E5 Xeons having it in general.
>>>
>>> Also, a second question, what amount of performance increase in GPU
>>> performance could one expect for a KVM/QEMU virtual machine with PCIE VGA
>>> passthrough using the posted interrupt feature of Broadwell-EP Xeons, using
>>> say a 1620 V4, 1630 V4, or 1650 V4, assuming those have the feature (if
>>> not, insert a frequency-optimized E5 2xxx instead) versus say a i7-5820k?
>>>
>>>
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>>
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