det-bypass

Research on temporal determinism (stability) of current OS bypass methods.

Objective

We want to evaluate latency and jitter in datacenter communication, using different kernel bypass methods. Moreover, we want to determine the system factors impacting jitter (determinism/stabililty). We focus particularly on periodic communication.

Methodology

Tools:

• no bypass
• RDMA
• DPDK
• eBPF XDP (to app: map polling, socket)

Timeframes:

• packet numbers: 10k,1mil, more
• absolute time: up to days

Benchmark variables:

• Endhost settings: {no isol, isol}, {intervals}, {interrupts shielding} {memory /paging}
• network settings: p2p, scale up

Evaluation methods:

• single/round trip latency: latency_buckets, update_max, packet_dump
  • metrics: max, avg, 99.x percentile
• jitter locality: TX stack, RX stack, network
• one way jitter: send and recv difference in periodic protocols