Jesper Brouer
Principal Kernel Systems Engineer at Cloudflare
Frederikssund, Capital Region of Denmark, Denmark
Summary
🤩
Rockstar🎓
Top SchoolJesper Brouer is a Principal Kernel Systems Engineer with 14+ years of deep Linux kernel experience, currently driving network and memory performance work at Cloudflare after a decade shaping kernel subsystems at Red Hat. He is a recognized XDP co-maintainer and has authored high-impact kernel optimizations—enough to be invited to invitation-only developer summits for both Memory Management and Networking. Jesper combines production-grade performance engineering (e.g., trafgen and libbpf contributions) with long-standing open source leadership in Netfilter and XDP, and his patches appear in the Linux kernel, iproute2, libpcap and Wireshark. He holds an M.Sc. in Computer Science from the University of Copenhagen and has been a frequent technical speaker since 2006, blending rigorous research-level tuning with pragmatic systems builds that scale to multi-10G networks.
14 years of coding experience
30 years of employment as a software developer
Cand. Scient Datalog, Computer Science, Cand. Scient Datalog, Computer Science at Københavns Universitet - University of CopenhagenStudent, Højere teknisk eksamen (HTX), Student, Højere teknisk eksamen (HTX) at Københavns Tekniske Skole
Stackoverflow
71reputation
8kreached
3answers
0questions
Github Skills (34)
socket-io10
debugging10
debug10
performance-monitor10
system-programming10
libbpf10
memory-management10
net10
c1110
linux-kernel10
networking10
bpf10
c1710
kernel10
socket10
Programming languages (10)
Github contributions (5)
xdp-project/xdp-tutorial
Feb 2019 - Oct 2022
XDP tutorial
Role in this project:
Back-end Developer & Systems Engineer
Back-end Developer & Systems EngineerContributions:1 release, 4 reviews, 330 commits in 3 years 8 months
Contributions summary:Jesper primarily contributed to the development of an XDP (Express Data Path) tutorial, focusing on creating and integrating BPF (Berkeley Packet Filter) programs. The contributions involved implementing example XDP programs, including functions for packet processing, dropping, and redirecting. The user also worked on setting up the build environment and utility programs for the XDP framework. These changes included code for loading, attaching, and detaching BPF programs from network interfaces, with associated tools for monitoring and collecting statistics.
bpflibbpfxdp
netsniff-ng/netsniff-ng
Dec 2013 - Aug 2014
A Swiss army knife for your daily Linux network plumbing.
Role in this project:Backend Engineer & Performance Engineer
Backend Engineer & Performance EngineerContributions:9 commits in 8 months
Contributions summary:Jesper primarily focused on optimizing the performance of the `trafgen` tool, a core component of the repository, by addressing kernel bottlenecks and improving socket interactions. Their contributions included modifying the RAW/PF_PACKET socket to bypass unnecessary kernel calls, resulting in significant performance gains. Further enhancements involved leveraging the `PACKET_QDISC_BYPASS` socket option to bypass the kernel's traffic control layer and adjusting the ring buffer size for optimal performance on high-speed networks. The user also addressed interface matching issues in `ifpps`.
routerosopenflowarmylinuxnetworking
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