Debian lenny 64 Host + KVM + enomalism + Debian lenny 64 Guest + Slow network SOLVED!
i have found out what the problem was:
The Host system has the following ethernet adapter:
00:07.0 Bridge: nVidia Corporation MCP61 Ethernet (rev a2)
The Guest is detecting (i do not know exactly why, but that was not the real problem):
00:03.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 20)
The real problem was that the Guest was loading the wrong driver - 3139too, i unloaded it and loaded the 3139cp, and everything is working very fast now. Just copied 1,1GB archive using the 100% of the network capacity!!!