Publications de Aikaterini Argyraki

Edge Caching as Differentiation

Pavlos Nikolopoulos, Muhammad Abdullah, Aikaterini Argyraki

Consider an end-user accessing two content providers, A and B, of the same type. If the end-user's ISP prioritizes A-traffic over B-traffic, the end-user may experience A-content with significantly better quality, and the ISP is said to apply "traffic diff ...

ACM2025

Flow/Path Performance Consistency

Pavlos Nikolopoulos, Aikaterini Argyraki, Georgia Fragkouli

We explore a new network-performance metric: flow/path consistency, which captures whether the end-to-end performance of the flows that traverse a network is consistent with the aggregate performance of the network's elements. We propose a formal definitio ...

ACM2024

Automatically Reasoning About How Systems Code Uses the CPU Cache

George Candea, Rishabh Ramesh Iyer, Aikaterini Argyraki

We present a technique, called CFAR, that developers can use to reason precisely about how their code, as well as third-party code, uses the CPU cache. Given a piece of systems code P, CFAR employs program analysis and binary instrumentation to automatical ...

2024

Caching and Neutrality

Pavlos Nikolopoulos, Muhammad Abdullah, Aikaterini Argyraki

We are used to defining network neutrality as absence of traffic differentiation, like policing or shaping. These mechanisms, however, are often not what determines end-users’ quality of experience (QoE). Most content today is accessed through edge caches, ...

ACM Association for Computing Machinery2023

The Case for Performance Interfaces for Hardware Accelerators

George Candea, Rishabh Ramesh Iyer, Jiacheng Ma, Aikaterini Argyraki

While systems designers are increasingly turning to hardware accelerators for performance gains, realizing these gains is painstaking and error-prone. It can take several person-months to determine if a given accelerator is a good fit for a given piece of ...

2023

Learning a QoE Metric from Social Media and Gaming Footage

Catalina Paz Alvarez Inostroza, Aikaterini Argyraki

Defining a universal metric for Quality of Experience (QoE) is notoriously hard due to the complex relationship between low-level performance metrics and user satisfaction. The most common metric, the Mean Opinion Score (MOS), has well-known biases and inc ...

2023

Using Gaming Footage as a Source of Internet Latency Information

Catalina Paz Alvarez Inostroza, Aikaterini Argyraki

Keeping track of Internet latency is a classic measurement problem. Open measurement platforms like RIPE Atlas are a great solution, but they also face challenges: preventing network overload that may result from uncontrolled active measurements, and maint ...

2023

Localizing Traffic Differentiation

Pavlos Nikolopoulos, Muhammad Abdullah, Aikaterini Argyraki, Zeinab Shmeis

Network neutrality is important for users, content providers, policymakers, and regulators interested in understanding how network providers differentiate performance. When determining whether a network differentiates against certain traffic, it is importa ...

2023

Performance Interfaces for Network Functions

George Candea, Rishabh Ramesh Iyer, Aikaterini Argyraki

Modern programmers routinely use third-party code, and infrastructure operators deploy software they did not write. This would not be possible without semantic interfaces---documentation, header files, specifications---that succinctly describe what that th ...

USENIX Association2022

Automated Verification of Network Function Binaries

George Candea, Solal Vincenzo Pirelli, Aikaterini Argyraki

Formally verifying the correctness of software network functions (NFs) is necessary for network reliability, yet existing techniques require full source code and mandate the use of specific data structures. We describe an automated technique to verify NF b ...

USENIX Association2022