Hrvoje Habjanić

Hrvoje is a Co-founder and Chief Architect at 5×9 Networks. He brings nearly two decades of experience from T-Hrvatski Telekom, where he worked on numerous international Deutsche Telekom initiatives.

His expertise spans a wide range of programming languages, databases, and virtualization technologies, enabling him to design complex, scalable systems.

Talk: Getting 1+ Tbps from an x86 server

This presentation explores the journey of achieving more than 1 Tbps throughput on a single x86 server by evolving a virtualized Broadband Network Gateway (vBNG). It walks through practical lessons learned while scaling from early multi-VM designs to a high-performance, single “Big VM” forwarder capable of extreme packet rates.

The talk covers the role of SR-IOV and Intel DPDK, extensive hardware tuning, deep code-level optimizations, and major redesigns driven by CPU cache behavior and PCIe bottlenecks. Real-world performance results, including achieving 200 Mpps per CPU and scaling to 1.6 Tbps, highlight how systematic optimization, modern hardware, and iterative engineering can unlock massive throughput gains on commodity servers.

Get your free ticket here https://www.entrio.hr/en/event/dorscluc-2026-28348 and see you at the DORS/CLUC 31!