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Linux Kernel Kernel Version

Target CPU Target OS Compiler

Last build

image

📌 Project Architecture & CI/CD Workflow

graph LR
    A["📄 Kconfig<br/>config-6.19.14-ryzen9"] --> B["⚙️ GitHub Actions Runner<br/>"]
    C["📦 Kernel Source 6.19.14<br/>(kernel.org)"] --> B
    B -->|"🔧 KCFLAGS='-march=znver3'"| D["🐧 make bindeb-pkg"]
    D --> E["📦 Debian .deb Packages<br/>(headers, image, dbg, libc-dev)"]
    E --> F["🚀 GitHub Release &<br/>📲 Telegram Notification"]
    E -->|"💻 sudo dpkg -i"| G["🖥️ Debian 13 Workstation<br/>(Ryzen 9 5950X + RX 6950 XT)"]

    style A fill:#2d3748,stroke:#4a5568,color:#fff
    style B fill:#1a202c,stroke:#319795,color:#fff
    style C fill:#2d3748,stroke:#4a5568,color:#fff
    style D fill:#2b6cb0,stroke:#3182ce,color:#fff
    style E fill:#2f855a,stroke:#38a169,color:#fff
    style F fill:#805ad5,stroke:#9f7aea,color:#fff
    style G fill:#dd6b20,stroke:#ed8936,color:#fff
Loading

⚡ Kernel Customization & Performance

Subsystem Configuration / Option Engineering Rationale
Target Architecture -march=znver3 (CONFIG_X86_NATIVE_CPU=y) Native AVX2/BMI2 instruction optimization for AMD Zen 3 microarchitecture.
Scheduler & Preemption PREEMPT_BUILD / PREEMPT=y Full kernel preemption for minimal input and audio processing latency.
Timer Frequency 1000 Hz (CONFIG_HZ_1000=y) High-resolution tick frequency for desktop responsiveness and frame pacing.
Tickless Kernel NO_HZ_FULL=y Adaptive tickless kernel to eliminate periodic timer interrupts on heavy workloads.
CPU Core Sizing CONFIG_NR_CPUS=32 Hardcapped to 32 threads matching Ryzen 9 5950X, eliminating virtual CPU overhead.
CPU Frequency Scaling amd-pstate EPP (CONFIG_X86_AMD_PSTATE=y) Hardware CPPC microsecond-level core frequency and voltage adjustments.
Core Scheduling CONFIG_SCHED_CORE=y SMT thread isolation and core scheduling for security and hyperthreading performance.
RCU Optimization CONFIG_RCU_BOOST=y / CONFIG_RCU_NOCB_CPU=y RCU callback offloading and boosting to eliminate desktop micro-stuttering.
TCP Congestion TCP BBR (CONFIG_DEFAULT_TCP_CONG="bbr") Bottleneck bandwidth RTT pacing algorithm to prevent bufferbloat and latency spikes.
eBPF JIT Compiler CONFIG_BPF_JIT=y / ALWAYS_ON Locked-on JIT compiler for zero-overhead packet filtering and eBPF execution.
eBPF Security (LSM) CONFIG_BPF_LSM=y In-kernel eBPF Linux Security Module for granular, high-performance security hooks.
Async Socket I/O IO_URING_ZCRX=y Zero-copy packet reception for ultra-fast network socket I/O.
GPU Driver & Display amdgpu + Display Core DCN 3.0 Native RDNA 2 support, Resizable BAR (ReBAR), and OverDrive power limit unlocking.
GPU ROCm Compute CONFIG_HSA_AMD=y / USERPTR=y Native AMD KFD driver for ROCm, OpenCL 3.0, and direct GPU user-pointer memory access.
Legacy Radeon Removal # CONFIG_DRM_RADEON is not set Legacy Radeon DRM driver disabled to ensure exclusive amdgpu driver stack execution.
AMD IOMMU Isolation CONFIG_AMD_IOMMU=y (# INTEL_IOMMU) Native AMD Vi IOMMU enabled while stripping unused Intel DMAR overhead.
Memory / Zswap zswap + lzo (CONFIG_ZSWAP=y) In-RAM compressed swap cache matching kernel boot parameters (zswap.compressor=lzo).
Hugepages & Compaction MADVISE + CONFIG_COMPACTION=y Background memory defragmentation and 2MB page allocation for heavy workloads.
Hung Task Diagnostics CONFIG_DETECT_HUNG_TASK=y (120s) Automatic detection and logging of blocked or hanging kernel threads.
Stack Unwinder UNWINDER_ORC=y Low-overhead ORC call stack unwinding for precise ftrace kernel profiling.
Hi-Res Audio Driver snd_ca0132 (Sound Core3D) Dedicated ALSA sound driver configured for 32-bit / 192 kHz high-resolution audio.
Bloat Trimming Disabled unused CPU/GPU/Drivers Removed Intel/Nvidia drivers, legacy AMD SI/CIK, and unused network vendors.

🛠️ Custom Kernel Optimizations & Performance Features (config-6.19.14-ryzen9)

This custom kernel build and CI/CD pipeline are specifically tuned for maximum performance, minimal latency, and zero bloat on AMD Ryzen 9 5950X (Zen 3) and AMD Radeon RX 6950 XT (RDNA 2) hardware running on Debian 13.

🧹 1. Hardware Trimming & Bloat Elimination

  • Non-AMD CPU Support Removed: Disabled Intel, Hygon, Centaur, and Zhaoxin CPU support (# CONFIG_CPU_SUP_INTEL is not set, etc.) to streamline kernel execution paths.
  • Unused GPU Drivers Removed: Disabled Intel i915 (# CONFIG_DRM_I915 is not set) and Nvidia Nouveau (# CONFIG_DRM_NOUVEAU is not set).
  • Legacy AMDGPU Generations Removed: Disabled legacy Southern Islands (SI) and Sea Islands (CIK) support (# CONFIG_DRM_AMDGPU_SI is not set, # CONFIG_DRM_AMDGPU_CIK is not set), eliminating si_support / cik_support parameter warnings in dmesg.
  • Targeted Wireless & Network Drivers: Kept strictly iwlwifi (Intel AX210) and igb (Intel I211), stripping unnecessary Realtek, Broadcom, Atheros, and Ralink wireless/ethernet drivers.
  • AMD IOMMU Isolation: Native AMD Vi IOMMU driver enabled (CONFIG_AMD_IOMMU=y), while disabling unused Intel DMAR overhead (# CONFIG_INTEL_IOMMU is not set).
  • Legacy Radeon Driver Disabled: Legacy Radeon DRM driver disabled (# CONFIG_DRM_RADEON is not set), ensuring exclusive amdgpu driver stack execution.
  • Legacy Controllers Disabled: Removed floppy, parallel ports (PARPORT), PCMCIA/CardBus, FireWire (IEEE1394), ISDN, and analog modems.

⏱️ 2. Low-Latency Tuning (Gaming & High-Res Audio)

  • Full Preemption: Full preemptible kernel (CONFIG_PREEMPT_BUILD=y, CONFIG_PREEMPT=y) for immediate task response and minimal audio/input latency.
  • Timer Frequency (1000 Hz): Set timer frequency to 1000 Hz (CONFIG_HZ_1000=y, CONFIG_HZ=1000) for precise event timing.
  • Tickless Full (NO_HZ_FULL): Adaptive tickless kernel (CONFIG_NO_HZ_FULL=y) preventing periodic timer interrupts on heavy workloads and gaming threads.
  • RCU Prioritization: RCU boosting (CONFIG_RCU_BOOST=y) and offloading (CONFIG_RCU_NOCB_CPU=y) to eliminate micro-stuttering.
  • Hi-Res Audio Driver: Dedicated Sound Blaster Z ALSA driver (snd_ca0132 / Sound Core3D) configured for 32-bit / 192 kHz low-jitter audio.

🧠 3. CPU Optimizations (AMD Ryzen 9 5950X — 16C / 32T)

  • Native Architecture Compilation: Target compilation set to Zen 3 (-march=znver3 via KCFLAGS="-march=znver3", CONFIG_X86_NATIVE_CPU=y).
  • Core Scheduling: Hardware SMT core scheduling enabled (CONFIG_SCHED_CORE=y) for thread isolation, security, and hyperthreading gaming performance.
  • Sized Core Count: Sized to CONFIG_NR_CPUS=32 matching exact hardware threads, removing virtual CPU overhead.
  • AMD P-State Driver: Native amd-pstate CPPC driver with EPP enabled (CONFIG_X86_AMD_PSTATE=y, CONFIG_X86_AMD_PSTATE_UT=y) for microsecond-level frequency scaling.

🎮 4. GPU & Display Core (Radeon RX 6950 XT / Navi 21)

  • Display Core (DCN 3.0): AMD Display Core enabled (CONFIG_DRM_AMD_DC=y, CONFIG_DRM_AMD_DC_DCN=y) optimized for Navi 21 architecture.
  • Heterogeneous Compute (ROCm / KFD): AMD HSA kernel driver (CONFIG_HSA_AMD=y) enabled for ROCm, Vulkan, and OpenCL compute.
  • Direct GPU Memory Access: CONFIG_DRM_AMDGPU_USERPTR=y allowing GPU direct access to user space memory pointers.
  • Resizable BAR & OverDrive: Full 16 GB VRAM BAR access and OverDrive power limit unlocking (amdgpu.ppfeaturemask=0xffffffff).

🌐 5. Networking & Congestion Control

  • TCP BBR Default: Configured with TCP BBR as the default congestion control algorithm (CONFIG_DEFAULT_TCP_CONG="bbr", CONFIG_DEFAULT_BBR=y). Eliminates bufferbloat and maximizes bandwidth throughput.
  • eBPF JIT & LSM: JIT compiler enabled and locked on (CONFIG_BPF_JIT=y, CONFIG_BPF_JIT_ALWAYS_ON=y) alongside eBPF Security Module (CONFIG_BPF_LSM=y) for zero-overhead security hooks.
  • IO_URING_ZCRX: Zero-copy network reception (CONFIG_IO_URING_ZCRX=y) enabled for ultra-fast socket I/O.

💾 6. Memory Tuning (Zswap lzo)

  • Zswap Storage: Native zswap with lzo compressor (CONFIG_ZSWAP=y, CONFIG_ZSWAP_COMPRESSOR_DEFAULT_LZO=y) matching kernel boot parameters.
  • Transparent Hugepages & Compaction: Active background memory compaction (CONFIG_COMPACTION=y) and Transparent Hugepages (CONFIG_TRANSPARENT_HUGEPAGE_MADVISE=y) for heavy memory workloads.

🛠️ 7. Diagnostics & CI/CD Pipeline

  • ORC Unwinder & Hung Task Detection: ORC stack unwinder (CONFIG_UNWINDER_ORC=y) and automatic 120s hung task detection (CONFIG_DETECT_HUNG_TASK=y).
  • Scheduler & Lock Debugging: Real-time scheduler statistics (CONFIG_SCHEDSTATS=y, CONFIG_SCHED_INFO=y) and lock debugging support (CONFIG_LOCK_DEBUGGING_SUPPORT=y).
  • Full Tracing Suite: FTRACE infrastructure (CONFIG_FTRACE=y, CONFIG_FUNCTION_TRACER=y, CONFIG_STACK_TRACER=y).
  • Automated Workflow: GitHub Actions workflow generating .deb packages with explicit -march=znver3 flags and dynamic Git commit changelogs on GitHub Releases.

🔍 Post-Boot Verification & Diagnostic Commands

After booting into the custom kernel, verify active optimizations using the following commands:

  • Check Active TCP Congestion Control (BBR):

    $ sysctl net.ipv4.tcp_congestion_control
net.ipv4.tcp_congestion_control = bbr

  • Check AMDGPU Driver & OverDrive Status:

    $ sudo dmesg | grep -i amdgpu
[    5.839374] amdgpu: Overdrive is enabled...
[    8.098516] amdgpu 0000:0d:00.0: amdgpu: [drm] Display Core v3.2.359 initialized on DCN 3.0

  • Check AMD P-State Scaling Driver:

    $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
amd-pstate-epp

  • Check Kernel Preemption Model (Full Preempt):

    $ dmesg | grep -i "preempt"
[    0.000000] Dynamic Preempt: full

  • Check Active Zswap Compressor:

    $ cat /sys/module/zswap/parameters/enabled
Y
$ cat /sys/module/zswap/parameters/compressor
lzo

  • Check eBPF JIT Compiler Status:

    $ sysctl net.core.bpf_jit_enable
net.core.bpf_jit_enable = 1

  • Check ORC Stack Unwinder Status:

    $ dmesg | grep -i "ORC"
[    0.000000] ORC unwinder alive

  • Check CPU Topology & 32-Thread Sizing:

    $ lscpu | grep -E "Model name|Thread\(s\) per core|CPU\(s\):"
CPU(s):                32
Thread(s) per core:    2
Model name:            AMD Ryzen 9 5950X 16-Core Processor

  • Extract Embedded Kernel Configuration from .deb:

    $ dpkg-deb --fsys-tarfile linux-image-6.19.14-ryzen9_*.deb | tar -x ./boot/config-6.19.14-ryzen9 -O | grep -E "CONFIG_DEFAULT_TCP_CONG|CONFIG_X86_NATIVE_CPU"
CONFIG_DEFAULT_TCP_CONG="bbr"
CONFIG_X86_NATIVE_CPU=y

Hardware

🐧 Kernel and Toolchain

Element Value
Kernel Linux 6.19.14-ryzen9
Model SMP PREEMPT_DYNAMIC
Base Distribution Debian 13
Compiler GCC 14.2.0
Target Architecture Zen 3
Grub GRUB_CMDLINE_LINUX_DEFAULT="quiet amdgpu.ppfeaturemask=0xffffffff zswap.enabled=1 zswap.compressor=lzo"

🧠 CPU

Component Details
Architecture x86_64 amd64
Core Architecture Zen 3
CPU AMD Ryzen 9 5950X (Vermeer)
Cores / Threads 16 cores / 32 threads
Socket AM4
Maximum Frequency ~4.9 GHz (boost)
TDP 105W
SMT Enabled
NUMA 1 node
Virtualization AMD-V enabled
L1 Cache 512 KiB (16×32 KiB data + 16×32 KiB instruction)
L2 Cache 8 MiB (16×512 KiB)
L3 Cache 64 MiB (2 CCDs)
Instruction Sets AVX2, FMA, AES-NI, SHA-NI, VAES, BMI1/2

💾 Memory RAM

Parameter Value
Total Capacity 128 GB
Configuration 4 × 32 GB
Type DDR4
Speed 3600 MT/s
Channels Dual Channel
ECC No
Model G.Skill F4-3600C18-32GTZN

🎮 GPU

Component Details
GPU AMD Radeon RX 6950 XT
Architecture RDNA 2 (Navi 21)
PCI ID 1002:73a5
Kernel Driver amdgpu
DRM/KMS Enabled

🎮 GPU APIs

API Version Device / Driver
AMDGPU 3.64.0 DRM 3.64 kernel driver for NAVI21 (6.19.14-ryzen9)
Vulkan 1.4.305 RADV (Mesa 25.0.7) for AMD Radeon RX 6950 XT
OpenCL 3.0 OpenCL C 1.2 via ROCr / RustiCL / Mesa
OpenGL 4.6 Mesa 25.0.7 (Compatibility Profile, LLVM 19.1.7)
BAR Enabled Runtime Detection: VRAM RAM=16368M, BAR=16384M (Resizable BAR Enabled)

🧩 Motherboard

Component Details
Motherboard Gigabyte X570 AORUS ELITE (rev. 1.0)
Chipset AMD X570
Manufacturer Gigabyte Technology Co., Ltd.
BIOS AMI (American Megatrends)
BIOS Version F40
BIOS Date 2025-10-29
Boot Mode UEFI
SMBIOS 3.3.0
AMD AGESA 1.2.0.F

🔐 Trusted Platform Module (TPM)

Parameter Value
Type fTPM (Firmware TPM)
Version TPM 2.0
Manufacturer AMD
Implementation AMD CPU fTPM
Interface CRB (Command Response Buffer)
ACPI TPM2 table present
Device /dev/tpm0, /dev/tpmrm0
Permissions tss group
Kernel Driver tpm_crb (built-in)
Status Enabled in UEFI
Compliance FIPS 140-2
TPM Revision 1.38
PCRs 24
Input Buffer 1024 bytes
Max Command Size 4096 bytes
Max Response Size 4096 bytes
Hardware RNG Disabled (CRB design)

🔊 Audio

Component Details
Sound Card Creative Sound Blaster Z
Chip CA0132 Sound Core3D
PCI ID 1102:0012
Driver ALSA (snd_ca0132)
Hi-res Audio Enabled 32 bits / 192kHz
Speakers Edifier M90

🌐 Network — Ethernet

Component Details
Controller Intel I211 Gigabit
PCI ID 8086:1539
Driver igb

📡 Wi-Fi / Bluetooth

Component Details
Wi-Fi Intel AX210
Standard Wi-Fi 6E (802.11ax)
PCI ID 8086:2725
Driver iwlwifi
Bluetooth 5.3
USB ID 8087:0032
Driver btusb + btintel (kernel modules loaded)

tux Linux kernel

The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software.

Quick Start

  • Report a bug: See Documentation/admin-guide/reporting-issues.rst
  • Get the latest kernel: https://kernel.org
  • Build the kernel: See Documentation/admin-guide/quickly-build-trimmed-linux.rst
  • Join the community: https://lore.kernel.org/

Essential Documentation

All users should be familiar with:

  • Building requirements: Documentation/process/changes.rst
  • Code of Conduct: Documentation/process/code-of-conduct.rst
  • License: See COPYING

Documentation can be built with make htmldocs or viewed online at: https://www.kernel.org/doc/html/latest/

Who Are You?

Find your role below:

  • New Kernel Developer - Getting started with kernel development
  • Academic Researcher - Studying kernel internals and architecture
  • Security Expert - Hardening and vulnerability analysis
  • Backport/Maintenance Engineer - Maintaining stable kernels
  • System Administrator - Configuring and troubleshooting
  • Maintainer - Leading subsystems and reviewing patches
  • Hardware Vendor - Writing drivers for new hardware
  • Distribution Maintainer - Packaging kernels for distros

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Kernel from source customised for my hardware

kernel.org

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