My name is Toke Høiland-Jørgensen. I’m a Linux kernel developer at Red Hat, where I work on the upstream kernel networking stack with a focus on XDP. I maintain xdp-tools, as well as the sch_cake qdisc and the ath9k WiFi driver in the kernel. I completed my PhD in November 2018 at Karlstad University in Sweden, after which I moved back to Denmark.

I have been involved in the bufferbloat project for several years, and apart from my kernel work, I am also the author of the Flent performance measurement tool and the sqm-scripts QoS configuration tool for OpenWrt. I also occasionally write other code, most of which I collect on Github.

When I’m not sitting in front of a computer, I like reading books, playing music (I’m a fairly mediocre drummer) and dancing Lindy Hop. I am also the “father” of Marvin, the world’s most adorable Rhodesian Ridgeback.


Reverse chronological order. Sadly I’ve been terrible at keeping this up to date, so it is reconstructed after the fact and probably has some holes in it.

  • “The Benefits of Open - for Research and Source Code”. Keynote, 18th Swedish National Computer Networking and Cloud Computing Workshop (SNCNW 2023), June 2023. Slides.

  • “Achieving lower latency with eBPF and XDP”. Understanding Latency webinar, Online, March 2023. Slides. Video.

  • “It’s the latency, stupid!” Driving IT, Copenhagen, Denmark, November 2022. Slides. Video.

  • “eBPF: Safely observe and extend your operating system”. DeiC conference, Kolding, Denmark, October 2022. Slides

  • “The Promise of eBPF for the Edge”. eBPF Summit, Online, September 2022. Slides. Video.

  • “Bringing packet queueing to XDP”. Linux Plumbers Conference, Dublin, Ireland, September 2022. Slides. Video.

  • “XDP + BPF_PROG_TEST_RUN = A programmable traffic generator!” Lund Linux Con, Lund, Sweden, April 2022. Slides

  • “Klar til, at internettet forsvinder på grund af krigen i cyberspace? Analogiseringsstyrelsen er!“. Podcast episode (as an interview subject, in Danish), Online, March 2022. Episode.

  • “Multiple XDP programs on a single interface - status and next steps”. Linux Plumbers conference, Online, August 2020. Slides. Video

  • “Bufferbloat and Beyond: How we reduced delays in the Linux networking stack by orders of magnitude”. Bornhack, Denmark, August 2019. Slides. Video.

  • “XDP feature planning” and “friendlier UAPI for XDP_REDIRECT”. Linux Kernel Developers’ Netconf 2019, Boston, USA, June 2019. Slides 1. Slides 2.

  • “Bufferbloat mitigation in the Linux WiFi stack – status and ongoing work”. Lund Linux Con, Lund, Sweden, May 2019. Slides.

  • “PoliFi: Airtime Policy Enforcement for WiFi”. IEEE WCNC ‘19, Marrakech, Morocco, Apr 2019. Slides.

  • “XDP hands-on tutorial”. With Jesper Brouer. NetDev 0x13, Prague, Czech Republic, Mar 2019. Slides. Video.

  • “The eXpress Data Path: Fast Programmable Packet Processing in the Operating System Kernel”. ACM CoNEXT ‘18, Heraklion, Greece, Dec 2018. Slides.

  • “Bufferbloat and Beyond: Removing Performance Barriers in Real-world Networks”. Thesis defence, Karlstad, Sweden, Nov 2018. Slides. Video.

  • “XDP - challenges and future work”. With Jesper Brouer. LPC Networking Track, Vancouver, Canada, Nov 2018. Slides.

  • “Update on the Bird implementation status of Babel”. IETF 101, London, UK, Mar 2018. Slides. Video

  • “Flent: The Flexible Network Tester”. ValueTools, Venice, Italy, Dec 2017. Slides.


Reverse chronological order.


Content on this blog is licensed under the CC BY-SA 4.0 license. Code is licensed under the GNU GPLv3.