During a design review, the administrator is asked to explain which underlying technology enables the NSX Edge to perform fast packet processing and achieve near line-rate performance for Virtual…

Question

Options

• AData Plane Development Kit (DPDK)
• BAMD Power Now
• CNon-Uniform Memory Access (NUMA)
• DIntel Speed Step

• A
  69% (18)
• B
  19% (5)
• C
  4% (1)
• D
  8% (2)

Explanation

The NSX Edge is the workhorse of the VMware Cloud Foundation networking stack, handling demanding tasks like Geneve encapsulation, NAT, Firewalling, and BGP routing. To achieve the throughput required for modern data centers--often exceeding 10Gbps or even 40Gbps per node- - NSX leverages the Data Plane Development Kit (DPDK). Traditional packet processing in a standard Linux or Unix kernel is often a bottleneck. The kernel must handle interrupts, context switching between user space and kernel space, and complex buffer management for every packet. This "overhead" limits the speed at which a CPU can move packets. DPDK changes this by bypassing the standard kernel networking stack entirely. It operates in User Space and uses a "polling" mechanism rather than an "interrupt-driven" one. In an NSX Edge VM or Bare Metal node, specific CPU cores are dedicated to the DPDK process (often called the Datapath or FP-Main). these cores "spin" at 100% utilization, constantly checking the NICs for new packets. Because there is no context switching and the process has direct access to the network hardware buffers, the Edge can process millions of packets per second (Mpps) with extremely low latency.

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