[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
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?
Jan
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel
|
