Owner: @Youngjoon Lee

Introduction

We have analyzed the impact of individual parameters on latency and bandwidth by Blend: Latency / Bandwidth Dynamics, with a uniform connection latency (50ms).

This document outlines the plan to extend the experiment by introducing diverse connection latencies. It focuses solely on the planning phase. The results of the extended experiment are documented in Blend: Multi-region Latency / Bandwidth Measurements.

Overview

Measurement Objectives

• Identifying combinations of parameter values that meet our latency and bandwidth requirement in the scenario resembling real-world conditions.

Construction

• Adjust the distribution of connection latency in order to reflect real-world variations.
• Analyze the resulting distribution of message latency, and check the percentage of messages that meet our latency requirements.
• Specifically, we want to have the following statements as a result:
  • F% of messages had a latency of L seconds or less,
    • with N nodes
    • with the distribution D of connection latency.
    • with the peering degree P
    • with H blend hops
  • We aim to identify combinations of N, D, P, and H that result in acceptable F and L.

Details

Connection Latency Distributions

The current simulator has a functionality to distribute nodes across three continents and specify connection latency between continents. However, three continents are not enough to reflect the real-world environment, considering the real distribution of Ethereum nodes.

To accommodate the realistic network distribution, the simulator needs to be updated as below.

• More granular regions: https://www.ethernodes.org/countries

• Connection latency between all regions: https://wondernetwork.com/pings

  • Latency numbers were chosen conservatively to ensure they reflect the most pessimistic results.

  https://docs.google.com/spreadsheets/d/1zrfjp4vogfCP-nmu9s4f84xmkfjMNT0fQRc9nVErtgU/edit?usp=sharing

Peering Degree

The peering degree will be set as a static value in this measurement, similar to the approach used in Blend: Latency / Bandwidth Dynamics, to simplify the interpretation of the results.