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

[Tomasz Wroblewski <tomasz.wroblewski@xxxxxxxxx>]

On 05/15/2014 03:23 PM, Jan Beulich wrote:
> > > > On 15.05.14 at 14:10, <tomasz.wroblewski@xxxxxxxxx> wrote:
> > Not really sure why it only affects 64bit vms but I've just noticed the
> > pci BARs for the card are being relocated by hvmloader as per some logs:
> >
> > (XEN) HVM3: Relocating guest memory for lowmem MMIO space enabled
> > (XEN) HVM3: Relocating 0xffff pages from 0e0001000 to 14dc00000 for
> > lowmem MMIO hole
> > (XEN) HVM3: Relocating 0x1 pages from 0e0000000 to 15dbff000 for lowmem
> > MMIO hole
> >
> > So it might be also related to that.
> Indeed it might - what are the (guest) MTRR types for those regions?
It's writeback for both the 32bit and 64bit above ranges.
> Jan

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