Tag: #kernel

한국어English日本語中文

← All posts

• Triton Gluon: The Language That Hand-Writes the Layouts the Compiler Used to Hide

  Gluon is a low-level GPU language built on the same compiler stack as Triton — it hands kernel authors the layouts, shared memory, and warp specialization that Triton normally keeps hidden. Its reason for existing is cle

  2026-07-16 · 19 min read #gpu#triton#kernel#compiler#performance

• The eBPF Verifier Only Tells You Where It Stopped — Measuring the Diagnostic Gap Across 235 Reproduced Rejections

  Anyone who has used eBPF has lived this: the verifier rejects your program, and the error message points at a line that looks perfectly innocent. A paper published in July 2026 is the first to put a number on that frustr

  2026-07-16 · 18 min read #ebpf#linux#kernel#debugging#developer-experience

• sched_ext Sub-Schedulers — the Per-cgroup Scheduler That Arrived Half-Done in Kernel 7.1

  Linux 7.1 (released June 14, 2026) landed cgroup sub-scheduler support for schedext. The goal is clear — attach a BPF scheduler anywhere in the cgroup tree, let parent schedulers dynamically allocate CPU to their childre

  2026-07-16 · 13 min read #linux#kernel#scheduler#cgroups#bpf

• bcachefs Drops the Experimental Tag from Erasure Coding — and What It Actually Means

  On September 29, 2025, Linus Torvalds erased 117,483 lines of bcachefs code from the kernel in a single commit, and bcachefs became a filesystem shipped as a DKMS module, like ZFS. That was the end of the drama — the rea

  2026-07-16 · 17 min read #linux#kernel#filesystem#bcachefs#storage

• Kernel Tuning for Low-Latency Trading Systems — The War Against Microseconds

  How to tune the Linux kernel in domains like HFT and market making where microseconds decide profit and loss. Covers CPU isolation recipes, NUMA alignment, the kernel-bypass spectrum, C-state pinning, PTP time synchroniz

  2026-06-13 · 17 min read #linux#kernel#low-latency#trading#performance

• Containers Are a Lie — The Kernel Truth Behind cgroups and Namespaces

  There is no container object in the kernel. A tour of the seven namespaces, hands-on cgroup v2 file manipulation, building a mini container with unshare and pivotroot, overlayfs, capabilities, and seccomp — we dissect ea

  2026-06-13 · 17 min read #linux#kernel#container#cgroups#namespaces

• eBPF Fundamentals — Programs, Maps, and the World of the Verifier

  A ground-up tour of how eBPF changed Linux kernel programming. We cover program types and maps, how the verifier works, and build a first eBPF program with libbpf and CO-RE from scratch.

  2026-06-13 · 19 min read #ebpf#linux#kernel#libbpf#observability

• The Evolution of the Linux CPU Scheduler — From CFS to EEVDF

  We follow the evolution of the Linux scheduler, from CFS implementing fairness with vruntime and a red-black tree, to EEVDF which became the default in kernel 6.6 to address latency-sensitive workloads. Covers cgroup CPU

  2026-06-13 · 17 min read #linux#kernel#scheduler#cfs#eevdf

• A Packet Journey — Tracing the Linux Kernel Networking Stack

  We dissect the full path a packet takes from the NIC through DMA, ring buffers, NAPI, and the IP/TCP layers to the application socket. Covers RSS/RPS/RFS multi-core scaling, GRO/GSO/TSO offloads, XDP, socket buffer tunin

  2026-06-13 · 19 min read #linux#kernel#networking#tcp#xdp

• Hacking the Linux Memory Hierarchy — swap, zram, and the Wild Idea of Swapping to VRAM

  The nbd-vram project, which exposes GPU VRAM as an NBD block device to use as swap, made waves on Hacker News. Starting from there, this post covers Linux memory management fundamentals, swappiness and zram/zswap tuning,

  2026-06-12 · 16 min read #linux#memory#swap#zram#kernel

• eBPF Is Eating Observability

  The idea of safely running sandboxed programs inside the kernel is upending observability. Hook anywhere with kprobes, uprobes, tracepoints, and XDP; the verifier guarantees safety; trace without touching a line of appli

  2026-06-11 · 13 min read #ebpf#observability#linux#kernel

• eBPF Deep Dive — The VM, Verifier, XDP, and CO-RE That Made the Linux Kernel Programmable (2025)

  Injecting safe code into the kernel — that is the eBPF revolution. This post dissects eBPF from internals to practice: the VM and bytecode, the Verifier that enforces safety, maps (Hash/Array/Ring Buffer/Perf), program t

  2026-04-15 · 15 min read #ebpf#linux#kernel#xdp#observability

• eBPF Complete Guide — A Tiny VM Inside the Kernel: Verifier, JIT, CO-RE, Maps, Attach Points, XDP, LSM, sched_ext (2025)

  Everything about eBPF — from cBPF in 1992 to eBPF in 2014 to schedext in 2024. The 11-register virtual machine ISA, the verifier's static analysis, JIT compilation, BTF and CO-RE, 17+ BPF map types, 200+ helper functions

  2026-04-15 · 31 min read #linux#kernel#ebpf#bpf#xdp

• eBPF Complete Guide 2025: Kernel Programming Revolution for Observability, Networking, Security

  Everything about eBPF! Safe Linux kernel programming, BCC vs libbpf vs bpftrace, Cilium (networking), Falco (security), Pixie (observability), Tetragon, CO-RE, real-world tracing, performance optimization, production cas

  2026-04-14 · 11 min read #ebpf#kernel#observability#networking#security

• The Complete Guide to Networking & Linux Internals — TCP/IP, DNS, iptables, systemd

  TCP/IP 4-layer model, DNS resolution, HTTP/HTTPS, Linux network stack, iptables/nftables, systemd, and process management — essential knowledge for infrastructure engineers.

  2026-04-12 · 18 min read #networking#linux#tcp-ip#dns#iptables

• Linux Kernel Parameter Tuning Guide: sysctl + Boot Params, Safe Changes and Rollback

  This guide covers Linux kernel tuning strategies using sysctl runtime parameters and boot parameters. It provides recommended values for networking, memory, filesystem, and security categories, along with pre-change back

  2026-03-07 · 11 min read #linux#kernel#sysctl#performance#tuning