Cisco Nexus X10 SmartNIC (K35-S) - Expansion Module - PCIe 3.0 X8 Low Profile - 10 Gigabit SFP+ X 2 - For UCS C240 M5, C240 M5L, SmartPlay Select C240 M5, SmartPlay Select C240 M5CL - NXN-K35-2X

• Easy to use
  In addition to a standard Linux driver, a transparent TCP and UDP acceleration library is included, as well as a library for low-level access. A transparent socket acceleration library allows applications to benefit from the low latency of a kernel bypass, in most cases without modifications to the applications. For the most latency-sensitive applications, a library called "libexanic" allows direct low-level access to the Cisco Nexus X10 SmartNIC K35-S hardware and includes simple functions for sending and receiving Ethernet frames. With the optional firmware development kit, it is even possible to extend the Cisco Nexus X10 SmartNIC K35-S firmware and add your own logic to the onboard FPGA.
• Advanced capture and timestamping
  Built-in timestamping functionality records each frame's arrival time to within 6.2 ns.
• Built-in bridging
  The Cisco Nexus X10 SmartNIC K35-S includes integrated support for bridging, which can further reduce latency by hundreds of nanoseconds. Normally, sharing an upstream connection between multiple servers would necessitate introducing a switch. The bridging feature allows the most latency-critical server to be directly connected to the upstream connection.

The Cisco Nexus X10 SmartNIC K35-S is a 10Gbps PCI Express network interface card specifically optimized for low latency environments.
While initially conceived and built for use in latency-sensitive financial applications such as high-frequency trading, the Cisco Nexus X10 SmartNIC K35-S has appeal that extends to any environment where latency is key. On an Intel Ivy Bridge test system, median latency from application to network to application is 780 nanoseconds for small packets, which is significantly better than competing network cards on the same hardware. Half-roundtrip TCP latencies are as low as 930 nanoseconds for small payloads.