Hi, I'm Qi Xi.
Infrastructure & Systems Engineer. I design high-throughput network backends, explore Linux kernel telemetry (eBPF), and optimize production edge clusters.
Core Specializations
Featured Work
Lightweight ingress/egress latency & packet loss telemetry agent using eBPF kprobes with sub-microsecond overhead.
Fault-tolerant distributed key-value store implementing Raft consensus, dynamic cluster membership, and log snapshotting.
Custom L4/L7 reverse proxy designed for intelligent traffic steering across multi-cloud edge compute nodes.
Selected Engineering Notes
Benchmarking High-Bandwidth QUIC Congestion Control in Cross-Border Fabrics
Analyzing throughput degradation and recovery dynamics between BBRv2 and Cubic over packet-lossy WAN transit.
Zero-Overhead Memory Accounting with Linux cgroups v2
Practical observations on PSI (Pressure Stall Information) under memory-constrained container environments.
Migrating iptables to Modern nftables Set Semantics on Edge Nodes
Eliminating lock contention during high-frequency PREROUTING table updates without dropping active sockets.