About Me

I am a Software Engineer and Ph.D. Candidate at the University of Helsinki in the Department of Computer Science. My Ph.D. supervisor is Prof. Sasu Tarkoma. My current research interests are low-latency networked systems and operating systems. I received my B.S. degree in 2013 and M.S. degree in 2016 in Computer Science from the University of Helsinki. My M.S. thesis focused on the performance evaluation of virtualization techniques, a core technology that enables today's cloud computing. I previously worked at ScyllaDB on the distributed database and on the OSv unikernel. I also have worked on the Linux kernel as a contributor and maintainer of the SLAB memory allocators.



  • Partition-Aware Packet Steering Using XDP and eBPF for Improving Application-Level Parallelism
    Pekka Enberg, Ashwin Rao, and Sasu Tarkoma
    ACM ENCP ’19
  • The Impact of Thread-Per-Core Architecture on Application Tail Latency
    Pekka Enberg, Ashwin Rao, and Sasu Tarkoma
    ACM/IEEE ANCS 2019
    [paper] [slides]
  • I/O Is Faster Than the CPU — Let's Partition Resources and Eliminate (Most) OS Abstractions
    Pekka Enberg, Ashwin Rao, and Sasu Tarkoma
    HotOS 2019
    [paper] [slides]
  • OSv—Optimizing the Operating System for Virtual Machines
    Avi Kivity, Dor Laor, Glauber Costa, Pekka Enberg, Nadav Har'El, Don Marti, and Vlad Zolotarov
    USENIX ATC 2014
    [paper] [slides]

Selected Projects

  • Manticore OS (October 2016–current, author)
    Implementing a research operating system to explore the parakernel model.
  • OSv (August 2013–July 2015, contributor)
    Implemented virtual memory management and virtual filesystem features to the OSv unikernel.
  • Sparse/LLVM (2011–2013, author)
    Implemented an LLVM backend for the Sparse semantic parser for C.
  • kvmtool (March 2010–August 2014, author)
    Implemented a light-weight hypervisor using Linux KVM subsytem for running Linux guests on a Linux host.
  • libcpu (2009–2014, contributor)
    Implemented a Intel x86 front-end for libcpu, a library for emulating several CPU architectures.


  • A Performance Evaluation of Hypervisor, Unikernel, and Container Network I/O Virtualization [pdf]
    Master's Thesis, University of Helsinki, August 2016