MRR Throughput

Maximum Receive Rate (MRR) tests are complementary to MLRsearch tests, as they provide a maximum “raw” throughput benchmark for development and testing community. MRR tests measure the packet forwarding rate under the maximum load offered by traffic generator over a set trial duration, regardless of packet loss.

MRR tests are currently used for following test jobs:

  • Report performance comparison: 64B, IMIX for vhost, memif.
  • Daily performance trending: 64B, IMIX for vhost, memif.
  • Per-patch performance verification: 64B.
  • PLRsearch soaking tests: 64B.

Maximum offered load for specific L2 Ethernet frame size is set to either the maximum bi-directional link rate or tested NIC model capacity, as follows:

  • For 10GE NICs the maximum packet rate load is 2x14.88 Mpps for 64B, a 10GE bi-directional link rate.
  • For 25GE NICs the maximum packet rate load is 2x18.75 Mpps for 64B, a 25GE bi-directional link sub-rate limited by 25GE NIC used on TRex TG, XXV710.
  • For 40GE NICs the maximum packet rate load is 2x18.75 Mpps for 64B, a 40GE bi-directional link sub-rate limited by 40GE NIC used on TRex TG,XL710. Packet rate for other tested frame sizes is limited by PCIeGen3 x8 bandwidth limitation of ~50Gbps.

MRR test code implements multiple bursts of offered packet load and has two configurable burst parameters: individual trial duration and number of trials in a single burst. This enables more precise performance trending by providing more results data for analysis.

Burst parameter settings vary between different tests using MRR:

  • MRR individual trial duration:
    • Report performance comparison: 1 sec.
    • Daily performance trending: 1 sec.
    • Per-patch performance verification: 10 sec.
    • PLRsearch soaking tests: 5.2 sec.
  • Number of MRR trials per burst:
    • Report performance comparison: 10.
    • Daily performance trending: 10.
    • Per-patch performance verification: 5.
    • PLRsearch soaking tests: 1.