Hey, I'm Hyunbin (bomberrie).
I'm a systems engineer in the United Kingdom working on Linux networking, packet processing, and storage. Most of my time is spent where high-level abstractions break down—tracking down subtle kernel bugs, writing eBPF tools to see what the network stack is actually doing, and making sure packets move at line rate.
Outside of code, I spend way too much time with my NixOS home lab, testing routing hardware on my own network, and listening to Rammstein. I like fixing problems at the root rather than papering over them in userspace.
Root Causes over Band-Aids
I prefer isolating and fixing regressions directly in the kernel tree over patching symptoms in userspace. If a packet drops or a disk stalls, I want to see the exact root cause in the driver or subsystem.
Selected Systems & Kernel Engineering
Selected kernel patches, packet telemetry tools, and storage experiments.
Zero conntrack L2 neighbor misroutes
Direct driver-layer zero-copy BPF hook
Lock-free LSM memtable flush rate
WireGuard dynamic shortest-path mesh
Resolving Flowtable PBR Egress MAC Corruption
Our upstream kernel patch invokes dst_neigh_lookup(&rt->dst, daddr) directly in the flow offload egress path. This ensures that the destination neighbor MAC address matches the active PBR routing table entry, completely eliminating L2 frame corruption while preserving 10 Gbps+ line-rate flowtable hardware offload speeds.
Open-Source Codebases & Engineering
Production kernel patches, packet telemetry tools, and lock-free storage engines backing our benchmark metrics.
Upstream kernel patch resolving L2 destination MAC corruption on multi-WAN Policy-Based Routing with hardware flowtable offload enabled.
Driver-layer zero-copy packet inspection and ringbuffer telemetry probe operating at 850ns latency before sk_buff allocation.
Lock-free NVMe storage engine experiments and sub-240ms dynamic shortest-path WireGuard failover daemon.
Hardware & Home Lab
The physical routers, storage nodes, and test benches where I reproduce bugs and benchmark kernel patches.
edge-gw-01.lan
Multi-WAN routing gateway & verification host
storage-node-01.lan
io_uring NVMe storage testbed & LSM bench
Synthetic Test Harness
Linux network namespace reproducer suite