---

About Me

Note that this page is no longer actively maintained. Please check my new page here

I graduated in June, 2017. I was a PhD student in the Department of Computer Science, University of Wisconsin-Madison.

My advisor was Prof. Aditya Akella. I was also a student in Wisconsin Institute on Software-defined Datacenters of Madison (WISDoM).

Before joining UW-Madison, I received my bachelor and master degrees from Xidian University (Xi'an, China) and Tsinghua University (Beijing, China) in 2009 and 2012 respectively.

Email: keqhe [AT] cs dot wisc dot edu

---

What I'm Working on

I am broadly interested in computer networks, with a focus on data center networks, software-defined networking and network measurement.

I enjoy building networked systems on real testbeds and using measurements to understand and improve the state-of-the-art.

---

Publications

• Low Latency Software Rate Limiters for Cloud Networks
  Keqiang He, Weite Qin, Qiwei Zhang, Wenfei Wu, Junjie Yang, Tian Pan, Chengchen Hu, Jiao Zhang, Brent Stephens, Aditya Akella and Ying Zhang.
  In Proceedings of APNet'17, Hong Kong, China, August 2017.
  [PAPER]     [SLIDES]    
  

• Improving Datacenter Network Performance via Intelligent Network Edge
  Keqiang He, University of Wisconsin-Madison, June 2017.
  [PHD THESIS]    

• AC/DC TCP: Virtual Congestion Control Enforcement for Datacenter Networks
  Keqiang He, Eric Rozner, Kanak Agarwal, Yu (Jason) Gu, Wes Felter, John Carter and Aditya Akella.
  In Proceedings of ACM SIGCOMM'16, Florianopolis, Brazil, August 2016.
  [PAPER]     [SLIDES]    
  

• PerfSight: Performance Diagnosis for Software Dataplanes
  Wenfei Wu, Keqiang He and Aditya Akella.
  In Proceedings of ACM IMC'15, Tokyo, Japan, October 2015.
  [PAPER]     [SLIDES]    
  

• Presto: Edge-based Load Balancing for Fast Datacenter Networks
  Keqiang He, Eric Rozner, Kanak Agarwal, Wes Felter, John Carter and Aditya Akella.
  In Proceedings of ACM SIGCOMM'15, London, UK, August 2015.
  [PAPER]     [SLIDES]    
  

• Measuring Control Plane Latency in SDN-enabled Switches
  Keqiang He, Junaid Khalid, Aaron Gember-Jacobson, Sourav Das, Chaithan Prakash, Aditya Akella, Li Erran Li and Marina Thottan.
  In Proceedings of ACM SIGCOMM Symposium on SDN Research (SOSR), Santa Clara, CA, June 2015.
  [PAPER]     [SLIDES]    
  

• Next Stop, the Cloud: Understanding Modern Web Service Deployment in EC2 and Azure
  Keqiang He, Alexis Fisher, Liang Wang, Aaron Gember, Aditya Akella and Thomas Ristenpart.
  In Proceedings of ACM IMC'13, Barcelona, Spain, October 2013.
  [PAPER]     [SLIDES]     [DATASETS]    
  

• Scalable Name Lookup in NDN Using Effective Name Component Encoding
  Yi Wang, Keqiang He, Huichen Dai, Wei Meng, Junchen Jiang, Bin Liu and Yan Chen.
  In Proceedings of IEEE ICDCS'12, Macau, China, June 2012.
  [PAPER]    
  

• Reducing Power of Traffic Manager in Routers via Dynamic On/Off-chip Scheduling
  Jindou Fan, Chengchen Hu, Keqiang He, Junchen Jiang and Bin Liu.
  In Proceedings of IEEE INFOCOM'12, Orlando, FL, March 2012.
  [PAPER]    
  

Tech Reports and Posters

• Improving Latency and Burst-tolerance for Software Rate Limiters
  Keqiang He, Weite Qin, Qiwei Zhang, Wenfei Wu, Junjie Yang, Tian Pan, Chengchen Hu, Jiao Zhang, Aditya Akella and Ying Zhang.
  USENIX NSDI'17 poster, Boston, MA, March 2017.
  [POSTER]    
  

• LiquidSwitch: Transport Enforcement for Datacenter Networks
  Keqiang He, Eric Rozner, Kanak Agarwal, Yu (Jason) Gu, Wes Felter, John Carter and Aditya Akella.
  USENIX NSDI'16 poster, Santa Clara, CA, March 2016.
  [POSTER]    
  

• Latency in Software Defined Networks: Measurements and Mitigation Techniques
  Keqiang He, Junaid Khalid, Aaron Gember-Jacobson, Sourav Das, Chaithan Prakash, Aditya Akella, Li Erran Li and Marina Thottan.
  In Proceedings of ACM SIGMETRICS'15 (extended abstract), Portland, OR, June 2015.
  [EXTENDED ABSTRACT]    
  

• High Speed Load Balancing at the Datacenter Edge
  Keqiang He, Eric Rozner, Kanak Agarwal, Wes Felter, John Carter and Aditya Akella.
  USENIX NSDI'15 poster, Oakland, CA, May 2015.
  [POSTER]    
  

• Mazu: Taming Latency in Software Defined Networks
  Keqiang He, Junaid Khalid, Sourav Das, Aditya Akella, Li Erran Li and Marina Thottan.
  University of Wisconsin-Madison, Technical Report TR1806, Madison, WI, 2014.
  [TECH REPORT]    
  

Internships

• Google Inc, Mountain View, CA. 2016.
• IBM Research & Cloud Inovation Lab, Austin, TX. Summer 2015.
• IBM Research, Austin, TX. Summer 2014.
• Bell Laboratories, Alcatel-Lucent, Murray Hill, NJ. Summer 2013.

Honors and Awards

• Lawrence H. Landweber NCR Fellowship in Distributed Systems, Dept of CS, UW-Madison, 2016.
• NSDI Student Grant, 2016, 2015.
• Tsinghua-Morgan Stanley Scholarship (top 5%), 2010.
• Outstanding Undergraduate (1st in major), 2009.
• First Prize in Shaanxi College Higher Mathematics Competition, 2007.
• Chinese National Scholarship, 2007.
• Second Prize in China Undergraduate Mathematical Contest in Modeling, 2007.

Skills

• Languages: English (working proficiency), Chinese (native language)
• Programming Languages: C++, C, Python, Java, Shell scripting, SQL, Verilog HDL
• Operating Systems: Unix/Linux, OS X, Windows
• Tools: Vim/Cscope, Eclipse, Matlab, Git, SVN, LATEX
• Others: TCP/IP, Networking, Data Center Networking, Cloud Computing, Kernel Programming

Courses

• Systems & Networking Challenges in Cloud Computing
• Data Models and Languages
• Principles of Programming Languages
• Introduction to Human-Computer Interaction
• Introduction to Computer Networks
• Machine Learning
• Introduction to Algorithms
• Advanced Computer Networks

---

Department of Computer Sciences
1210, W. Dayton St.,
Madison, WI 53706.