How and When You Should Measure CPU Overhead of eBPF Programs Bryce Kahle, Datadog October 28, 2020 Why should I profile eBPF programs? CI variance tracking Tools kernel.bpf_stats_enabled kernel bpf_stats_enabled sysctl – Added in kernel v5.1 (off by default) – Turns on stats collection for all eBPF programs – exposes total run_time_ns and run_cnt – Use cases: – Benchmarking + CI/CD – Sampling profiler results in go benchmark format Can be used with benchstat and other tools kprobe runtime comparison programs no-helper add helper call benchmark program and results Thank you!

- No modifications of the tracee rbperf rbperf - Profile Ruby programs rbperf - Profile Ruby programs - Trace complex Ruby programs execution rbperf – on-CPU profiling - $ rbperf record --pid=124 the stack walking for a dynamic language - Supporting multiple Ruby versions Challenges - Implementing the stack walking for a dynamic language - Supporting multiple Ruby versions - Correctness testing testing Challenges - Implementing the stack walking for a dynamic language - Supporting multiple Ruby versions - Correctness testing - BPF safety features Future plans - Integrate in Facebook’s profiling

connectivity and IP address management is managed by the non-Cilium CNI plugin, but Cilium attaches BPF programs to the network devices created by the non-Cilium plugin to provide L3/L4/L7 network visibility & (IPAM) via ENI. After the initial networking is setup, the Cilium CNI plugin is called to attach BPF programs to the network devices set up by aws-cni to enforce network policies, perform load-balancing, and allocation (IPAM). After the initial networking is setup, the Cilium CNI plugin is called to attach BPF programs to the network devices set up by Azure CNI to enforce network policies, perform load-balancing,

achieving ecosystem interoperability through shared capabilities. With a unified OS architecture supporting all mainstream computing architectures, openEuler is one of the best open source OSs for aims to provide a comprehensive overview of openEuler's architecture and its capabilities in supporting various digital infrastructure scenarios. 20.03 First innovation version Kernel innovative center infrastructure. In addition to accelerating I/O on the data plane, DPUs/IPUs are also supporting the offloading of management- and control- plane components. This means that all management and

processing sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222 12.1.7 Utility programs for shell script . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 1.13 List of shell programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 7.9 List of programs related to manipulating character clipboard . . . . . . . . . . . . . . . . . . . . . . . . . .

they’re sharing your host machines’ kernel. If Host-Reachable Services wasn’t disabled, the eBPF programs attached by Cilium may be out of date and no longer routing api-server requests to the current kind-control-plane Recreating the kind cluster and using the helm command Install Cilium will detach the inaccurate eBPF programs. Crashing Cilium agent pods Check if Cilium agent pods are crashing with following logs. This BPF cgroup type programs attached to the parent cgroup hierarchy of the kind container nodes. In such cases, either tear down Cilium, or manually detach the overlapping BPF cgroup programs running in the

they’re sharing your host machines’ kernel. If Host-Reachable Services wasn’t disabled, the eBPF programs attached by Cilium may be out of date and no longer routing api-server requests to the current kind-control-plane Recreating the kind cluster and using the helm command Install Cilium will detach the inaccurate eBPF programs. Cluster Mesh With Kind we can simulate Cluster Mesh in a sandbox too. Kind Configuration This connectivity and IP address management is managed by the non-Cilium CNI plugin, but Cilium attaches eBPF programs to the network devices created by the non-Cilium plugin to provide L3/L4 network visibility, policy

parameter). This ensures that Kind nodes have their own cgroup namespace, and Cilium can attach BPF programs at the right cgroup hierarchy. To verify this, run the following commands on the host, and check they’re sharing your host machines’ kernel. If Host-Reachable Services wasn’t disabled, the eBPF programs attached by Cilium may be out of date and no longer routing api-server requests to the current kind-control-plane Recreating the kind cluster and using the helm command Install Cilium will detach the inaccurate eBPF programs. Crashing Cilium agent pods Check if Cilium agent pods are crashing with following logs. This

they’re sharing your host machines’ kernel. If Host-Reachable Services wasn’t disabled, the eBPF programs attached by Cilium may be out of date and no longer routing api-server requests to the current kind-control-plane Recreating the kind cluster and using the helm command Install Cilium will detach the inaccurate eBPF programs. Cluster Mesh With Kind we can simulate Cluster Mesh in a sandbox too. Kind Configuration This connectivity and IP address management is managed by the non-Cilium CNI plugin, but Cilium attaches BPF programs to the network devices created by the non-Cilium plugin to provide L3/L4/L7 network visibility &

they’re sharing your host machines’ kernel. If Host-Reachable Services wasn’t disabled, the eBPF programs attached by Cilium may be out of date and no longer routing api-server requests to the current kind-control-plane Recreating the kind cluster and using the helm command Install Cilium will detach the inaccurate eBPF programs. Crashing Cilium agent pods Check if Cilium agent pods are crashing with following logs. This BPF cgroup type programs attached to the parent cgroup hierarchy of the kind container nodes. In such cases, either tear down Cilium, or manually detach the overlapping BPF cgroup programs running in the