News from Justine Sherry's Research Group

August 31, 2020

Fall Teaching: Information about 15-441/641 is all online at You can schedule office hours to meet with me here.

August 13, 2020

Textbooks tell us that requests to a cache result in two possible outcomes: hits and misses. Nirav Atre discusses today at SIGCOMM 2020 that there is actually a third possible outcome: a delayed hit. Nirav shows that by optimizing for delayed hits, caches can have 45% lower latency than delayed hits unaware caches. You can read the paper here and learn more by watching the video.

August 13, 2020

When network functions share the same server, they achieve slower performance than if they run alone. But why does this happen even when the server is configured to isolate processors and NIC queues? And how can we predict the slowdown? Antonis Manousis explains today at SIGCOMM 2020. You can read the paper here or watch the video to learn more.

August 10, 2020

Rukshani Athapathu, Tooba Bajwa, and Serena Vincent all presented at the N2Women workshop co-hosted with SIGCOMM 2020. Read about Rukshani’s work on Internet fairness here; Tooba’s work on optimal sketching parameters here; and Serena’s work on NADA congestion control here. Talk videos are available at the workshop homepage.

(Keep an eye out – Rukshani and Serena are applying to PhD programs this Fall!)

June 03, 2020

I am honored to be named to DARPA’s ISAT Study Group, which aims to identify new areas of development in computer and communication technologies and to recommend future research directions.

March 20, 2020

I was happy to answer some questions for The Daily Telegraph, Vox Recode, and Pittsburgh’s WPXI about why increased Internet traffic due to COVID19 isolation won’t break the Internet, but might still make videoconferencing harder.

February 26, 2020

Thank you to CMU’s Cylab for investing seed funding into our research on Internet Fairness! Read here about this year’s round of Cylab grants, including a grant for our group to develop an Internet Fairness testbed.

February 07, 2020

For our HotNets 2019 paper, `Beyond Jain’s Fairness Index’, the IRTF has awarded a 2020 Applied Networking Research Prize to project lead Ranysha Ware. Congratulations, Ray!

December 30, 2019

Applications to apply to CMU’s REUSE program are now open. This program brings students to CMU to participate in research over the summer, and funds room, board, travel, and a stipend for accepted students. Apply here to intern in my group during Summer 2020.

December 14, 2019

I am delighted that Roger Yang, our high school intern, has been accepted to CMU to begin his bachelor’s degree! We will be so lucky to have him with us for the next four years.

November 27, 2019

Ranysha Ware and I were featured in an hourlong interview in the Packet Pushers `Heavy Networking’ podcast. In the interview, Ranysha discusses her research on BBR, deployment of new congestion control algorithms, and how to test whether new algorithms are acceptable to deploy on the Internet. Listen here.

November 18, 2019

When multiple Internet connections share the same link, they compete for resources. Should connections be required to share the link fairly? If the outcomes are unfair, how unfair can they be? Ranysha Ware presented new guidelines for depoying new congestion control algorithms at HotNets 2019. Read more here.

October 28, 2019

We’re seeing some media coverage [The Telegraph] [Wired Italian] [Vice] on our BBR findings which were published last week at the Internet Measurement Conference. To clear up some common questions, I’ve written a Medium post in Q&A format.

October 22, 2019

Ranysha Ware presented our research on modeling the BBR congestion control algorithm at IMC 2019. Watch her presentation on how and why BBR can be unfair to other senders on the Internet here, and read the paper to learn more.

September 30, 2019

Gizmodo asked me and several Internet experts, ‘What would it take to shut down the entire Internet?’

August 20, 2019

Current Teaching: Information for 15-441/641 is all online at

May 10, 2019

My keynote presentation at the Simpósio Brasileiro de Redes de Comunicação e Sistemas Distribuídos is now online. I the talk, I discuss testing and evaluation of fairness for new congestion control algorithms. Watch here in Portuguese.

March 15, 2019

Google gave our group a Faculty Research Award to study Internet fairness and BBR congestion control. Thank you, Google!

March 01, 2019

The NSF awarded our group a grant to study fairness on the Internet. Thank you, NSF!

February 15, 2019

My PhD student Nirav was interviewed about his career path from high school in India to graduate school at CMU.

December 19, 2018

My PhD student Ranysha was named a Facebook Emerging Scholar. Congratulations, Ray!

July 18, 2018

Popular Science interviewed me on why websites always seem to break at the worst possible times.