On Tue, Nov 09, 2010 at 03:37:44PM +0800, lidong chen wrote: > sorry,i take mistake, > > the ept violation is not caused by 2M hugepages, but caused by e1000 > emulated by qemu. > I test uesd 2M hugepages and virio, the performance is better than > e1000. but is still worse than xen. I will continue to find out other > reason. > > > > so, there are two question: > 1.why have so many ept violation when used e1000? > > > 2.when used virtio, there ara also such error happen.is this normal? > I add the printk in function tdp_page_fault below. > pfn = gfn_to_pfn(vcpu->kvm, gfn); > if (is_error_pfn(pfn)) { > kvm_release_pfn_clean(pfn); > if( printk_ratelimit() ) { > printk(KERN_EMERG "error gpa is %ld\n", gpa); > } > return is_fault_pfn(pfn) ? -EFAULT : 1; > } > > and result is: > [root@rhel6-kvm1 ~]# dmesg -c > __ratelimit: 387 callbacks suppressed > error gpa is 4273995776 > error gpa is 4273995776 > error gpa is 4273995776 > error gpa is 4273995776 > error gpa is 4273995776 > You should really print this in hex :) This is 0xfec00000 AKA IOAPIC. Try to configure virtio to use MSI. -- Gleb. -- 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