Possible to reach more than 1Gbit to VM?

[TooMeeK <toomeek_85@o2.pl>]

Hello,

I've been playing around with KVM since few years.
But now I'm wondering is it possible to mix bonding+bridging together to 
reach more than single Gigabit link between Client and VM?
Looking over net, everyone says to use LACP.. but I did it already and 
it worked, but still at 1 NIC speed.

This is my working setup on Debian Squeeze 64bit:

*cat /proc/net/bonding/bond0*
/Ethernet Channel Bonding Driver: v3.5.0 (November 4, 2008)

Bonding Mode: load balancing (round-robin)
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 200
Down Delay (ms): 200

Slave Interface: eth1
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:11:22:33:44:55

Slave Interface: eth2
MII Status: up
Link Failure Count: 0
Permanent HW addr: 55:44:33:22:11:00/

*cat /etc/network/interfaces*
/auto lo
iface lo inet loopback

# The bonded network interface for LAN
auto bond0
iface bond0 inet manual
     bond-slaves none
     bond-mode   balance-rr
     bond-miimon 100
     #bond_lacp_rate fast
     #bond_ad_select 0
     arp_interval 80
     up /sbin/ifenslave bond0 eth1 eth2
     down /sbin/ifenslave bond0 -d eth1 eth2

#Onboard NIC #1 Nvidia Gigabit
auto eth1
iface eth1 inet manual
     bond-master bond0

#NIC #2 Intel PRO/1000 F Server Adapter - FIBER
auto eth2
iface eth2 inet manual
     bond-master bond0

# Bridge to LAN for virtual network KVM
auto br0
iface br0 inet static
     address 10.0.0.250
     netmask 255.255.255.0
     network 10.0.0.0
     broadcast 10.0.0.255
     gateway 10.0.0.249
     dns-nameservers 10.0.0.249 8.8.8.8
     bridge-ports  bond0
     bridge-fd     9
     bridge-hello  2
     bridge-maxage 12
     bridge-stp    off

#NIC #3 - modem
auto eth0
iface eth0 inet manual

#Bridge LAN to virtual network KVM - modem
iface br1 inet manual
         bridge_ports eth0
         bridge_stp off
         bridge_fd 0
         bridge_maxwait 0
         metric 1
auto br1/

*cat /etc/modprobe.d/bonding.conf*
/alias bond0 bonding
options bonding mode=balance-rr miimon=100 downdelay=200 updelay=200 
arp_interval=80/

I've tried following already (single switch, not multiple):
- LACP in Debian + LACP on the switch
- static bond0 (round-robin) + static link aggregation on the switch for 
both Client and Hypervisor
- tried several switches (HP V1910, 3Com 3824 and Planet GSD-802S)
- tried several NICs, including Intel PRO/1000 F and MF fiber adapters
- for example I can reach ~1,9Gbit between two non-virtualised servers 
using 3Com 3824 and NO link aggregation configured on the switch
- I already reached almost native (940Mbit/s) from Client to VM using 
virtio-net and Debian.
- tests using iperf, iSCSI, NFS. To avoid I/O limits - using ramdisks.

Questions:.
- is it even possible?
- maybe I have to create MORE bridge interfaces, one per NIC and set up 
aggregated link inside VM then?
- can bridge interface limit bandwidth to 1Gbit?

Regards,
Tom