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Re: [Xen-devel] GPU passthrough performance regression in >4GB vms due to XSA-60 changes

>>> On 19.05.14 at 12:42, <tomasz.wroblewski@xxxxxxxxx> wrote:
> Actually seems to be like the plausible explanation for the performance 
> issues we see could be that
> - some region of guest space has been relocated by hvmloader out to 
> 64bit memory to enlarge pci mmio hole (which stays in 32bit space)
> - BUT the caching on that relocated region is UC since at the time of 
> the relocation MTRR was disabled and that caused the EPT entry to get UC 
> type.

But this would be easily seen from 'D' debug key output - did you
check this is what is the case?


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