I am an Assistant Professor in the Department of Computer Science at the University of Virginia.
I received my Ph.D. in Computer Science from Cornell University, where I was advised by Rachit Agarwal. Before that, I earned my Master’s degree from Princeton University, where I was advised by Jennifer Rexford. I completed my undergraduate studies in computer science at the University of Michigan.
My research broadly spans computer networks, operating systems, and computer hardware.
I am recruiting Ph.D. students for Fall 2026. If you are interested in working with me, please email me with your CV and research interests. Please also apply to the UVA CS Ph.D. program and mention my name in your statement.
News
- [Mar ’26] Sepia is accepted to OSDI ’26.
- [Feb ’26] Serving on the SIGCOMM ’26 Program Committee.
- [Dec ’25] Serving on the CoNEXT ’26 Program Committee.
- [Oct ’25] Giving an invited talk at Purdue University.
- [Oct ’25] Giving a guest lecture at Sungkyunkwan University.
- [Jul ’25] Co-chairing the SIGCOMM ’25 Artifact Evaluation Committee.
- [Jul ’25] Joining UVA as an Assistant Professor.
- [Mar ’25] Serving on the NSDI ’26 Program Committee.
Students
Selected Publications
When DDIO Meets Page Coloring: Revisiting DDIO Performance with Sepia
Changwoo Song, Sanghyun Kim, Jinhyeok Oh, Qizhe Cai, Joonsung Kim, Jaehyun Hwang
USENIX OSDI 2026
[paper]
Fast & Safe IO Memory Protection
Benny Rubin, Saksham Agarwal, Qizhe Cai, Rachit Agarwal
ACM SOSP 2024
[paper]
[github]
Building Networked Systems for Terabit Ethernet (Ph.D. thesis)
Qizhe Cai, Cornell University, August 2024
[paper]
High-throughput and Flexible Host Networking for Accelerated Computing
Athinagoras Skiadopoulos, Zhiqiang Xie, Mark Zhao, Qizhe Cai, et al.
USENIX OSDI 2024
[paper]
Harmony: A Congestion-free Datacenter Architecture
Saksham Agarwal, Qizhe Cai, Rachit Agarwal, David Shmoys, Amin Vahdat
USENIX NSDI 2024
[paper]
[github]
Towards µs Tail Latency and Terabit Ethernet: Disaggregating the Host Network Stack
Qizhe Cai, Midhul Vuppalapati, Jaehyun Hwang, Christos Kozyrakis, Rachit Agarwal
ACM SIGCOMM 2022
[paper]
[github]
dcPIM: Near-Optimal Proactive Datacenter Transport
Qizhe Cai, Mina Tahmasbi Arashloo, Rachit Agarwal
ACM SIGCOMM 2022
[paper]
[github]
Understanding Host Network Stack Overheads
Qizhe Cai, Shubham Chaudhary, Midhul Vuppalapati, Jaehyun Hwang, Rachit Agarwal
ACM SIGCOMM 2021
[paper]
[github]
TCP ≈ RDMA: CPU-efficient Remote Storage Access with i10
Jaehyun Hwang, Qizhe Cai, Ao Tang, Rachit Agarwal
USENIX NSDI 2020
[paper]
[github]
Network-Wide Heavy Hitter Detection for Real-Time Telemetry (Master’s Thesis)
Qizhe Cai, Princeton University, June 2018
[paper]
Network-Wide Heavy Hitter Detection with Commodity Switches
Rob Harrison, Qizhe Cai, Arpit Gupta, Jennifer Rexford
ACM SOSR 2018
[paper]
Teaching
- Spring 2026: CS 4457: Computer Networks
- Fall 2025: CS 6501: Datacenter Network Infrastructure
Service
Program Committee Member
External Reviewer
- IEEE Transactions on Network and Service Management
- IEEE Transactions on Mobile Computing
- Computer Networks
- IEEE Transactions on Consumer Electronics
- IEEE Network Magazine