Kubernetes P99 latency can burn while CPU, packets, and dashboards look fine. This talk shows how hidden TCP queues inside pods can trap small gRPC or HTTP/2 requests behind bulk traffic, defeating user-space prioritization after sendmsg(). Using eBPF, we expose unsent kernel bytes, connect them to tail latency, and explore how pod-level sysctls like net.ipv4.tcp_notsent_lowat can restore backpressure while revealing surprising risks in “safe” platform defaults.
Linux, Networking, and Go. It’s a somewhat unconventional way to introduce myself, but one that closely reflects who I am. These are the areas that capture my interest in understanding how systems work and what happens beneath their abstractions. That curiosity also extends to the community, where I’m involved as a CNCF Ambassador and an organizer of CNCG in Peru, in addition to having been part of KCD Lima. Professionally, I work as a Platform Engineer.
