Gigabit network card not fully operational using KVM/Ubuntu

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Hi folks,

Host: Ubuntu 10.04.3 with KVM
lspci | grep net
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06)

Guest: Ubuntu 10.04.3
lspci:
00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02)
00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II]
00:01.2 USB Controller: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II] (rev 01)
00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03)
00:02.0 VGA compatible controller: Cirrus Logic GD 5446
00:03.0 Ethernet controller: Qumranet, Inc. Virtio network device

Problem: The virtio network device operates on 100Mbits.

How do I know that it operates on 100Mbits ?
I copy a single big file via rsh and I can see the real speed. The network is completely dedicated to this operations, that is, there is no other traffic between other machines.

Question: What do I have to do to use full bandwidth ?

If this is not the best forum to ask this question, do you suggest another channel ?

Thanks in advance,
Josir Gomes

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