On Thu, Apr 04, 2013 at 04:14:57PM +0300, Gleb Natapov wrote: > > > > > >>> is to move to MMIO only when PIO address space is exhausted. For PCI it > > >>> will be never, for PCI-e it will be after ~16 devices. > > >> > > >> Ok, let's go back a step here. Are you actually able to measure any speed in performance with this patch applied and without when going through MMIO kicks? > > >> > > >> > > > That's the question for MST. I think he did only micro benchmarks till > > > now and he already posted his result here: > > > > > > mmio-wildcard-eventfd:pci-mem 3529 > > > mmio-pv-eventfd:pci-mem 1878 > > > portio-wildcard-eventfd:pci-io 1846 > > > > > > So the patch speedup mmio by almost 100% and it is almost the same as PIO. > > > > Those numbers don't align at all with what I measured. > I am trying to run vmexit test on AMD now, but something does not work > there. Next week I'll fix it and see how AMD differs, bit on Intel those are the > numbers. > The numbers are: vmcall 1921 inl_from_kernel 4227 outl_to_kernel 2345 outl is specifically optimized to not go through the emulator since it is used for virtio kick. mmio-pv-eventfd is the same kind of optimization but for mmio. -- Gleb. _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
