[vfio-users] posted interrupts

[P. Pronk]

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 
> <mailto: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
>     <mailto: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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