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.
News
- [May ’26] Understanding Network Stack Latency is accepted to SIGCOMM ’26. Congrats to Tianyu!
- [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
Understanding Host Network Stack Latency
Tianyu Zuo, Jaehyun Hwang, Ao Tang, Rachit Agarwal, Qizhe Cai
ACM SIGCOMM 2026
[paper]
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