[vfio-users] posted interrupts

[Joshua Lee]

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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