Architecting Low-Latency High-Availability Linux Microclusters

Modern cloud-native and bare-metal environments demand predictable low-latency networking, optimal kernel throughput, and zero-downtime fault tolerance.

Kernel Network Stack Optimization

To achieve sub-millisecond packet processing under heavy connection concurrency, we tune key Linux kernel sysctl parameters:

# Increase system socket receive and send buffers
sudo sysctl -w net.core.rmem_max=16777216
sudo sysctl -w net.core.wmem_max=16777216
sudo sysctl -w net.ipv4.tcp_rmem="4096 87380 16777216"
sudo sysctl -w net.ipv4.tcp_wmem="4096 65536 16777216"

eBPF Tracing for Low-Overhead Observability

With eBPF programs loaded into kernel space, telemetry runs at wire speed without expensive context switches:

SEC("tracepoint/syscalls/sys_enter_connect")
int trace_connect(struct trace_event_raw_sys_enter *ctx) {
    bpf_printk("TCP handshake initiated via eBPF probe\n");
    return 0;
}

Architecture Tip: Always pin eBPF maps to bpffs to preserve telemetry counters across process restarts.