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Date: Mon, 31 Oct 2011 10:27:50 +0100
From: Til Obes <til@obes.name>
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Subject: [Qemu-devel] Performance of USB2.0
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To: qemu-devel@nongnu.org

Hello all,

i want to use a virtual router which is connected to a cable box
via an usb ethernet controller. The device itself runs properly
at normal usage. But inside the virtual machine i get only about 7MBit.
I configured the the usb device with the following xml syntax of
libvirt:
<controller type='usb' index='0' model='ehci'>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x07' 
function='0x0'/>
     </controller>
<hostdev mode='subsystem' type='usb' managed='no'>
       <source>
         <vendor id='0x9710'/>
         <product id='0x7830'/>
       </source>
     </hostdev>

Inside the guest i get this output of lsusb:
Bus 001 Device 002: ID 9710:7830 MosChip Semiconductor MCS7830 10/100 
Mbps Ethernet adapter
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

lsusb -v shows this output for the root hub:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Device Descriptor:
   bLength                18
   bDescriptorType         1
   bcdUSB               2.00
   bDeviceClass            9 Hub
   bDeviceSubClass         0 Unused
   bDeviceProtocol         0 Full speed (or root) hub
   bMaxPacketSize0        64
   idVendor           0x1d6b Linux Foundation
   idProduct          0x0002 2.0 root hub
   bcdDevice            2.06
   iManufacturer           3 Linux 2.6.32-5-amd64 ehci_hcd
   iProduct                2 EHCI Host Controller
   iSerial                 1 0000:00:07.0

Does this "Full speed" mean, that it is still running with 12MBit?

What is the status of High Speed USB (480Mbit) inside the guest?
What versions do i need? I currently use Debian Sid:
qemu-kvm (0.15.1)
libvirt0-dbg (0.9.6-2)
Kernel: Linux server 3.0.0-2-amd64 #1 SMP x86_64 GNU/Linux

Regards Til