How can the default networking device be changed to improve network performance for KVM in Red Hat Enterprise Linux 5.4?

Updated -

Release Found: Red Hat Enterprise Linux 5.4

Problem

By default, KVM virtual machines created in Red Hat Enterprise Linux 5.4 have a virtual Realtek 8139 (rtl8139) NIC (network interface controller). The rtl8139 virtual NIC works fine in most environments, but it can suffer from performance degradation problems on some networks, for example, a 10 GigE (10 Gigabi...

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