[Libguestfs] [p2v PATCH 4/4] Makefile.am: speed up the boot phase of the "virt-p2v in a VM" tests

The "piix3-usb-uhci" QEMU device emulates a USB1 controller. Not only does USB1 feature amazingly low transfer speeds -- which QEMU appears to emulate faithfully --, USB1 (and USB2 too) are distinctly virtualization-unfriendly, as the emulated controllers require constant polling. This is visible in two symptoms: (a) the "run-virt-p2v-in-a-vm" and "run-virt-p2v-in-an-nvme-vm" targets load data (such as the root filesystem) from the "virt-p2v.img" file very slowly, while the host CPU utilization of QEMU never exceeds ~30%, (b) once the virt-p2v application launches in the guest, and the cursor is blinking in the "Conversion server" text field, the host CPU utilization does not sink under ~12% (while "top" in the guest XTerm reports 99+% idleness). Fix this problem by using the qemu-xhci USB3 controller. USB3 both enables much higher transfer speeds and is event-driven, requiring no polling. Signed-off-by: Laszlo Ersek <lersek(a)redhat.com&gt; --- Makefile.am | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/Makefile.am b/Makefile.am index f25de74b8690..f2fe0e3efc99 100644 --- a/Makefile.am +++ b/Makefile.am @@ -270,7 +270,7 @@ run-virt-p2v-in-a-vm: virt-p2v.img $(PHYSICAL_MACHINE) -cpu host \ -m 2048 \ -drive id=hd0,file=$(PHYSICAL_MACHINE),format=raw,if=ide \ - -device piix3-usb-uhci \ + -device qemu-xhci \ -drive id=usb0,file=$<,format=raw,snapshot=on,if=none \ -device usb-storage,bootindex=1,drive=usb0 \ -boot menu=on \ @@ -294,7 +294,7 @@ run-virt-p2v-in-an-nvme-vm: virt-p2v.img $(PHYSICAL_MACHINE) $(BLANK_DISK) -device nvme,drive=phys,serial=01234567 \ \ -drive id=usb0,if=none,format=raw,file=$<,snapshot=on \ - -device piix3-usb-uhci,id=usb-bus \ + -device qemu-xhci,id=usb-bus \ -device usb-storage,drive=usb0,bootindex=1,bus=usb-bus.0 \ \ -drive id=blank1,if=none,format=raw,file=$(BLANK_DISK),snapshot=on \