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This Network Adapter appears to the host operating system as two independent PCI Express devices, one for each network port. Each of the two devices (Lanai-Z8ES chips) can carry traffic at rates approaching 10Gb/s (~9.9 Gb/s with a 9KB MTU, or ~9.5 Gb/s with a 1500B MTU). Together, the two devices can carry traffic between the host and the network at rates approaching 20Gb/s.
If both devices are using the bundled Myri10GE Ethernet software distribution and if the hosts have sufficient memory bandwidth, the netperf TCP_STREAM test with two streams shows an aggregate bandwidth of ~19.8 Gb/s with a 9KB MTU, and ~18.9 Gb/s with a 1500B MTU. These netperf 2.4.3 tests were between Intel Nehalem-EP hosts running the RHEL5 kernel 2.6.18-92.el5. Performance will vary with the host and operating system.