[vfio-users] CPU Question

[Bradley Davis]

What is the feature called that Xeon E5s have that others do not? I'm not
seeing references to ACS on Intel ARC. I have an Intel Xeon X5660 and i'm
trying to see if my processor has the feature. Maybe I just got lucky with
my motherboard having each PCIe slot in its IOMMU group.

On Thu, Sep 3, 2015 at 2:45 PM, Alex Williamson <alex.williamson at redhat.com>
wrote:

> On Thu, 2015-09-03 at 21:11 +0200, Daniel wrote:
> > I'm planning to use a i7 6700k (4x 4 Ghz, supports Vt-d) which has
> > hyperthreading. How many cores and how many threads would you assign to
> > the VM?
>
> <8 vCPUs total
>
> >  Is it possible to let the host use 4 threads (each connected to
> > a different physical core) and to let the VM use 4 threads (each
> > connected to a different physical core)?
>
> Yes
>
> >  So that the VM has access to
> > all 4 physical cores of the CPU to get highest gaming perfomance. I
> > searched around but I didn't find a clear answer.
>
> That's all fine and good, but as I keep advising, Xeon E5 is the only
> known reliable way to avoid isolation issues that may require you to
> forever patch your kernel with the ACS override path.  Keep this in mind
> as you trail blaze a new platform that has no user reports yet regarding
> device isolation and thus IOMMU grouping.  Thanks,
>
> Alex
>
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