Yang Zhang <yang.zhang.wz@xxxxxxxxx> wrote: > On 2016/4/28 23:32, Radim Krčmář wrote: >> I think we are talking about extending KVM's IR-less x2APIC, when >> standard x2APIC is the future. > > Yes, Since IR is only useful for the external device, and 255 CPUs is enough to handle the interrupts from external devices. Besides, i think virtual VT-d will bring extra performance impaction for devices, so if IR-less X2APIC also works well with more than 255 VCPUs, maybe extending KVM with IR-less x2apic is not a bad idea. So will you use x2APIC physical mode in this system? Try not to send a multicast IPI to 400 cores in the VM... Nadav-- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
