Build resilient systems at scale
28–30 October 2015 • Amsterdam, The Netherlands

Calibrating performance metrics

Hossein Lotfi (Google)
11:50–12:30 Thursday, 29/10/2015
Location: G102/103
Average rating: ***..
(3.39, 33 ratings)

Prerequisite Knowledge

Some experience in setting up and reviewing network measurements.


In this talk we use a number of real examples, drawn from network and system measurements, to demonstrate that performance metrics are not always what we expect. Specifically, we examine cases where TCP-measured latency and throughput, and metrics reported by client browsers, require calibration to avoid inaccurate conclusions. We will also discuss the value of establishing trends, with examples to encourage operators to understand the data before they really need it.

Photo of Hossein Lotfi

Hossein Lotfi


As a member of Google networking team, Hossein Lotfi’s passion is to run complex and cross-functional networking programs. Prior to Google Hossein led performance engineering at EdgeCast (a CDN acquired by Verizon), where his full-stack team of engineers were working on troubleshooting complex network problems and finding ways to improve CDN performance.