I am using Xen-4.4.0, libvirt-1.2.9<br><br>My ubuntu.cfg is: <br><br>ubuntu10.cfg<br>
      <br>
      bootloader = "/usr/local/lib/xen/boot/hvmloader"<br>
      builder="hvm"<br>
      memory = 512<br>
      name = "ubuntu"<br>
      vif = [ "type=ioemu,bridge=ovsbr0", "type=ioemu,bridge=ovsbr0","type=ioemu,bridge=ovsbr0","type=ioemu,bridge=ovsbr0",,"type=ioemu,bridge=ovsbr0"]<br>device_model_version = "qemu-xen-traditional"<br><br><br>If I didnot add " device_model_version = "qemu-xen-traditional" "&nbsp; to ubuntu.cfg,&nbsp; I only can add four NICs to VM. <br>If I&nbsp; add five or more,,&nbsp; I got these errors:<br><br>libxl: error: libxl_dm.c:1371:device_model_spawn_outcome: domain
      12 device model: spawn failed (rc=-3)<br>
      libxl: error: libxl_create.c:1186:domcreate_devmodel_started:
      device model did not start: -3<br>
      libxl: error: libxl_dm.c:1475:kill_device_model: Device Model
      already exited<br><br><br>If I  add " device_model_version = "qemu-xen-traditional" "&nbsp; to ubuntu.cfg, I can apply 8 NICs to VM.<br><br>But, I want to create domU by virsh(libvirt),&nbsp; so How convert&nbsp; " device_model_version = "qemu-xen-traditional"" to xml file used by virsh?<br>and How many NIC can a VM have? what leads to this limit£¿<br><br><span><br>--<br>Best Regards,<div>yandong</div></span><br><br><br>