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.

Last build

📌 Project Architecture & CI/CD Workflow

graph TD
    subgraph Job1["🔍 1. Prepare Environment (Debian Container)"]
        A1["📦 Kernel Source<br/>(kernel.org / Git Tag)"] --> A3["🔧 make olddefconfig<br/>(+ Optional Patch)"]
        A2["📄 Kconfig<br/>(configs/ or Remote)"] --> A3
        A3 --> A4["📤 Upload Source Artifact"]
    end

    subgraph Job2["🐧 2. Build Kernel & Release (Debian Container)"]
        B1["📥 Download Source Artifact"] --> B2["🐧 make bindeb-pkg<br/>(KCFLAGS='-march=znver3')"]
        B2 --> B3["📦 Debian .deb Packages<br/>(headers, image, dbg, libc-dev)"]
        B3 --> B4["🚀 GitHub Release"]
    end

    subgraph Job3["📤 3. Telegram Notification"]
        C1["📲 Send Status &<br/>Logs to Telegram"]
    end

    Job1 --> Job2
    Job2 --> Job3
    B4 -->|"💻 sudo apt install ./linux-*.deb"| D["🖥️ Workstation<br/>"]

    style Job1 fill:#1a202c,stroke:#319795,color:#fff
    style Job2 fill:#1a202c,stroke:#2b6cb0,color:#fff
    style Job3 fill:#1a202c,stroke:#805ad5,color:#fff
    style D fill:#dd6b20,stroke:#ed8936,color:#fff

⚡ Kernel Customization & Performance

🧠 CPU, Architecture & Topology

Subsystem / Option	Kconfig Option	Engineering Rationale
Native CPU Optimization	`CONFIG_X86_NATIVE_CPU=y` + `KCFLAGS="-march=znver3"`	Two-layer native optimization: `X86_NATIVE_CPU` enables Kconfig host ISA feature detection; `-march=znver3` directs GCC to emit Zen 3-specific instructions (AVX2/BMI2/VAES).
CPU Core Sizing	`CONFIG_NR_CPUS=32`	Hardcapped to 32 exact 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 scaling (`X86_AMD_PSTATE_UT` disabled in production).
NUMA Topology	`CONFIG_NUMA=y` / `# CONFIG_NUMA_BALANCING is not set`	NUMA topology retained (`AMD_NUMA=y`, `X86_64_ACPI_NUMA=y`); automatic scan balancing disabled to eliminate overhead on single-node Ryzen systems.
Core Scheduling	`CONFIG_SCHED_CORE=y`	SMT thread isolation and core scheduling for security and hyperthreading gaming performance.

⏱️ Scheduler, Latency & Ticks

Subsystem / Option	Kconfig Option	Engineering Rationale
Scheduler & Preemption	`CONFIG_PREEMPT_BUILD=y` / `CONFIG_PREEMPT=y`	Fully preemptible kernel for minimal input processing and audio latency.
Timer Frequency	`1000 Hz` (`CONFIG_HZ_1000=y`, `CONFIG_HZ=1000`)	High-resolution tick frequency for desktop responsiveness and precise frame pacing.
Tickless Kernel	`CONFIG_NO_HZ_IDLE=y`	Idle-tickless mode: suppresses timer interrupts on idle CPUs, reducing wakeup overhead.
Extensible Scheduler	`CONFIG_SCHED_CLASS_EXT=y` & `CONFIG_EXT_GROUP_SCHED=y`	Support for dynamic userspace eBPF schedulers (`scx_bpfland`, `scx_rusty`).

🎮 GPU RDNA 2, Display & Compute (ROCm)

Subsystem / Option	Kconfig Option	Engineering Rationale
GPU Driver Stack	`CONFIG_DRM_AMDGPU=m`	AMDGPU driver as loadable kernel module. Native RDNA 2 support, 16 GB Resizable BAR (ReBAR), and unlocked OverDrive power limits.
AMD Display Core	`CONFIG_DRM_AMD_DC=y` / `CONFIG_DRM_AMD_DC_FP=y`	AMD Display Core with fast-path support for DCN 3.0 (Navi 21 / RX 6950 XT).
VRAM Cgroup Management	`CONFIG_CGROUP_DMEM=y`	cgroups v2 Device Memory controller for dynamic VRAM resource allocation and priority control on `amdgpu`.
Heterogeneous Compute	`CONFIG_HSA_AMD=y` / `CONFIG_DRM_AMDGPU_USERPTR=y`	Native AMD KFD driver for ROCm, Vulkan, 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 execution of the `amdgpu` driver stack.

🌐 Networking, Sockets & Congestion Control

Subsystem / Option	Kconfig Option	Engineering Rationale
TCP Congestion	TCP BBR (`CONFIG_DEFAULT_TCP_CONG="bbr"`)	Bottleneck bandwidth RTT pacing algorithm to prevent bufferbloat and latency spikes.
Targeted Network Stack	`CONFIG_IGB=m` / `CONFIG_IXGBE=m` / `CONFIG_IWLWIFI=m`	Targeted Intel network stack: I211 Gigabit (`igb`), 10GbE (`ixgbe` + `libie`), and AX210 Wi-Fi 6E (`iwlwifi` / `btusb`).
Async Socket I/O	`CONFIG_IO_URING_ZCRX=y`	Zero-copy packet reception for ultra-fast network socket I/O via `io_uring`.

💾 Memory Management, ZRAM & Storage

Subsystem / Option	Kconfig Option	Engineering Rationale
Memory / Zswap	`CONFIG_ZSWAP=y` (`zswap.compressor=lzo`)	In-RAM compressed swap cache matching kernel boot parameters.
ZRAM Devices	`CONFIG_ZRAM=y` (`zram.comp=lzo-rle`)	Compressed RAM block devices for high-performance dynamic swap.
Loop & RAM Disk	`CONFIG_BLK_DEV_LOOP=m` / `CONFIG_BLK_DEV_RAM=m`	Support for mounting ISO/disk images (`loop`) and RAM disk block devices.
Hugepages & Compaction	`THP MADVISE` (`CONFIG_TRANSPARENT_HUGEPAGE_MADVISE=y`)	Transparent Hugepages default set to `madvise` with memory compaction to avoid bloat while enabling opt-in 2MB hugepages.

🔊 Audio, Multimedia & Gaming Input

Subsystem / Option	Kconfig Option	Engineering Rationale
Hi-Res Audio Driver	`CONFIG_SND_HDA_CODEC_CA0132=m`	Dedicated CA0132 Sound Core3D ALSA codec module with DSP support for Sound Blaster Z 32-bit / 192 kHz audio.
PlayStation Controllers	`CONFIG_HID_PLAYSTATION=m` / `CONFIG_PLAYSTATION_FF=y`	Sony DualSense (PS5) & DualShock 4 (PS4) controller support with haptic Force Feedback over USB and Bluetooth.
Virtual User Input	`CONFIG_INPUT_UINPUT=m`	User-space `/dev/uinput` interface for input emulation, virtual gamepads, and software remapping (Steam Input).
USB Webcams & Video	`CONFIG_USB_VIDEO_CLASS=m` / `CONFIG_VIDEOBUF2_V4L2=m`	Video4Linux2 pipeline and UVC driver for USB webcams with physical evdev button support.
Legacy USB Controllers	`CONFIG_USB_EHCI_HCD=m` / `OHCI` / `UHCI`	USB 2.0 and 1.1 host controller drivers for maximum legacy USB peripheral compatibility.

🔐 Security, Integrity & Diagnostics

Subsystem / Option	Kconfig Option	Engineering Rationale
CPU Security Mitigations	`CONFIG_CPU_MITIGATIONS=y`	Full Spectre, Meltdown, Retpoline, SRSO (Zen 3), RetBleed, and SSB CPU security mitigation suite active.
Control Flow Integrity	`CONFIG_X86_CET=y` / `CONFIG_X86_KERNEL_IBT=y`	Hardware-enforced Indirect Branch Tracking for kernel control-flow integrity on Zen 3.
User Shadow Stack	`CONFIG_X86_USER_SHADOW_STACK=y`	CET Shadow Stack for user-space return address protection.
eBPF Security (LSM)	`CONFIG_BPF_LSM=y` / `CONFIG_BPF_JIT=y`	In-kernel eBPF Linux Security Module with eBPF JIT compiler enabled and active by default.
Stack Unwinder & Tracing	`UNWINDER_ORC=y` / `DEBUG_INFO_BTF=y`	Low-overhead ORC call stack unwinding and Pahole split-BTF typeinfo for eBPF/ftrace kernel profiling.
Module Cleanup (91%)	233 Essential Modules (`=m`)	Massive 91% reduction in loadable modules (from 2,631 to 233). Removed unused Intel/NVIDIA GPUs, unused network vendors, and TV/DVB cards.

🛠️ Custom Kernel Optimizations & Performance Features

This custom kernel build and CI/CD pipeline are specifically tuned for this exact hardware: AMD Ryzen 9 5950X (Zen 3) and AMD Radeon RX 6950 XT (RDNA 2) running on Debian 13.

The guiding philosophy is aggressive module & bloat removal (91% module reduction, from 2,631 down to 233 essential modules) while retaining security, performance, and diagnostic capabilities:

🔧 CPU-specific optimization (Zen 3, 32 threads, AMD pstate, PREEMPT, 1000 Hz)
🎮 GPU-specific support (RDNA 2 / amdgpu module, ROCm, VRAM cgroups)
🌐 Targeted network drivers only (Intel I211 igb + Intel 10GbE ixgbe + Intel AX210 iwlwifi / btusb)
🔐 Security retained (all CPU mitigations, CET/IBT, BPF LSM)
🔍 Diagnostics retained (BTF, Ftrace, Kprobes, ORC)
🗑️ Hardware bloat removed (Intel GPU, NVIDIA, legacy Radeon, unused network vendors, legacy buses, TV/DVB)

🧹 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), igb (Intel I211 Gigabit), and ixgbe (Intel 10GbE), 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 & Buses: Removed floppy, parallel ports (PARPORT), PCMCIA/CardBus, FireWire (IEEE1394), ISDN, and analog modems, while retaining legacy USB host controllers (CONFIG_USB_EHCI_HCD=m, CONFIG_USB_OHCI_HCD=m, CONFIG_USB_UHCI_HCD=m) for full legacy USB 1.1/2.0 device compatibility.
DVB & TV Capture Removal: Disabled DVB digital/analog TV, SDR radio, and PCI capture cards (# CONFIG_DVB_CORE is not set, # CONFIG_MEDIA_PCI_SUPPORT is not set), while preserving USB webcam support (CONFIG_USB_VIDEO_CLASS=m, CONFIG_UVC_COMMON=m, VIDEOBUF2).

⏱️ 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 Idle (NO_HZ_IDLE): Idle-tickless kernel (CONFIG_NO_HZ_IDLE=y) suppressing timer interrupts on idle CPUs, reducing wakeup overhead. Full tickless mode (NO_HZ_FULL) is intentionally not enabled to avoid scheduler complexity on this configuration.
Hi-Res Audio Driver: Dedicated Sound Blaster Z ALSA driver (snd_ca0132 / Sound Core3D) configured for 32-bit / 192 kHz low-jitter audio.
PlayStation DualSense & DualShock 4: Dedicated Sony PlayStation HID driver (CONFIG_HID_PLAYSTATION=m, CONFIG_PLAYSTATION_FF=y) with full haptic Force Feedback for PS4/PS5 gamepads over USB and Bluetooth.
Virtual User Input (uinput): Enabled CONFIG_INPUT_UINPUT=m for user-space input emulation (Steam Input, virtual gamepads, software controller remapping).

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

Native Architecture Compilation — two-layer optimization:
- CONFIG_X86_NATIVE_CPU=y — instructs Kconfig to probe the build host CPU and enable matching kernel features (e.g., VAES, AVX2 crypto paths, AMD-specific code paths).
- KCFLAGS="-march=znver3" — instructs GCC to emit Zen 3-specific instructions throughout the build. Set in the CI workflow (make bindeb-pkg KCFLAGS="-march=znver3").
- Both flags are complementary and required for full native optimization; neither alone is sufficient.
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) for microsecond-level frequency scaling (# CONFIG_X86_AMD_PSTATE_UT is not set in production).
NUMA Infrastructure: NUMA support is retained (CONFIG_NUMA=y, CONFIG_AMD_NUMA=y, CONFIG_X86_64_ACPI_NUMA=y) for correct hardware topology detection. Automatic NUMA balancing (# CONFIG_NUMA_BALANCING is not set) is disabled to eliminate background memory scan overhead on this single-node Ryzen system.
eBPF Extensible Scheduler (sched-ext): Enabled in-kernel eBPF scheduler class (CONFIG_SCHED_CLASS_EXT=y). This exposes the sched-ext API that relies on the kernel BPF infrastructure (CONFIG_BPF=y, CONFIG_BPF_SYSCALL=y, CONFIG_BPF_JIT=y). External schedulers like scx_bpfland or scx_rusty can be loaded at runtime via userspace tools — they are not part of this kernel build.
Extended Group Scheduling: CONFIG_EXT_GROUP_SCHED=y enables the extended group scheduling infrastructure used by sched-ext and cgroup-aware scheduling policies.

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

AMDGPU as Module: CONFIG_DRM_AMDGPU=m — the AMDGPU driver is a loadable kernel module, not built into the kernel image. This is the standard Debian/upstream configuration for GPU drivers.
Display Core (DCN 3.0): AMD Display Core enabled (CONFIG_DRM_AMD_DC=y) with fast-path support (CONFIG_DRM_AMD_DC_FP=y), optimized for Navi 21 / RDNA 2 architecture (DCN 3.0).
Additional AMDGPU features: Audio CoProcessor (CONFIG_DRM_AMD_ACP=y), Secure Display (CONFIG_DRM_AMD_SECURE_DISPLAY=y), and ISP support (CONFIG_DRM_AMD_ISP=y) enabled.
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).
VRAM Cgroup Management (CONFIG_CGROUP_DMEM=y): Enabled cgroups v2 Device Memory controller for amdgpu, allowing dynamic VRAM priority allocation (dmemcg-booster) to eliminate stutter under heavy VRAM pressure.

🌐 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.
Targeted Network Stack: Includes Intel I211 (igb), Intel 10GbE (ixgbe), and Intel AX210 Wi-Fi 6E / Bluetooth 5.3 (iwlwifi / btusb).
eBPF JIT & LSM: JIT compiler enabled and active by default (CONFIG_BPF_JIT=y, CONFIG_BPF_JIT_DEFAULT_ON=y) alongside eBPF Security Module (CONFIG_BPF_LSM=y) for zero-overhead security hooks. BPF_JIT_ALWAYS_ON is intentionally not set, preserving runtime control via net.core.bpf_jit_enable.
IO_URING_ZCRX: Zero-copy network reception (CONFIG_IO_URING_ZCRX=y) enabled for ultra-fast socket I/O.

💾 6. Memory Tuning (Zswap, ZRAM & Loop)

Zswap Storage: Native zswap with lzo compressor (CONFIG_ZSWAP=y, CONFIG_ZSWAP_COMPRESSOR_DEFAULT_LZO=y) matching kernel boot parameters.
ZRAM Compressed RAM Devices: CONFIG_ZRAM=y (zram.comp=lzo-rle) enabled for compressed swap/RAM block devices.
Loop & RAM Disk Devices: CONFIG_BLK_DEV_LOOP=m and CONFIG_BLK_DEV_RAM=m enabled for mounting disk images and loopback/RAM devices.
Transparent Hugepages (madvise): Set THP default to madvise (CONFIG_TRANSPARENT_HUGEPAGE_MADVISE=y) alongside memory compaction (CONFIG_COMPACTION=y) to prevent system-wide memory bloat while enabling 2MB hugepages for opt-in applications (games, emulators, KVM).

🛠️ 7. Diagnostics & Tracing Infrastructure

CONFIG_DEBUG_KERNEL=y is set intentionally. This enables the diagnostic/tracing infrastructure without heavyweight runtime overhead — KASAN, KFENCE, SLUB_DEBUG, DEBUG_VM, and lock validators are not set.

ORC Unwinder & Hung Task Detection: ORC stack unwinder (CONFIG_UNWINDER_ORC=y) and automatic 120s hung task detection (CONFIG_DETECT_HUNG_TASK=y).
Scheduler Statistics: Real-time scheduler statistics (CONFIG_SCHEDSTATS=y, CONFIG_SCHED_INFO=y) for performance profiling and perf sched analysis.
Full Ftrace Suite: Complete function tracing infrastructure (CONFIG_FTRACE=y, CONFIG_FUNCTION_TRACER=y, CONFIG_FUNCTION_GRAPH_TRACER=y, CONFIG_DYNAMIC_FTRACE=y, CONFIG_STACK_TRACER=y).
Kernel Probes: CONFIG_KPROBE_EVENTS=y, CONFIG_UPROBE_EVENTS=y, CONFIG_BPF_EVENTS=y — enabling perf, bpftrace, and eBPF-based tracing tools.
BTF Type Information: CONFIG_DEBUG_INFO_BTF=y and CONFIG_DEBUG_INFO_BTF_MODULES=y — required for CO-RE eBPF programs and tools like bpftool and bpftrace.
Block I/O Tracing: CONFIG_BLK_DEV_IO_TRACE=y for blktrace/blkparse disk I/O analysis.
Automated Workflow: GitHub Actions workflow generating .deb packages with explicit -march=znver3 flags and dynamic Git commit changelogs on GitHub Releases.

🔐 8. CPU Security & Mitigations (Zen 3 / x86_64)

This kernel is not a "performance at all costs" build — all CPU security mitigations are retained:

CPU Mitigations Enabled: Full mitigation suite active (CONFIG_CPU_MITIGATIONS=y), including Spectre v1/v2, Retpoline, SRSO (AMD-specific Zen), SSB, RetBleed, IBPB entry, SLS, and TSA.
Page Table Isolation: KPTI enabled (CONFIG_MITIGATION_PAGE_TABLE_ISOLATION=y) for Meltdown protection.
AMD SRSO Mitigation: Speculative Return Stack Overflow mitigation (CONFIG_MITIGATION_SRSO=y) — directly relevant for Zen 3 microarchitecture.
Control Flow Integrity (CET/IBT): Hardware-enforced Indirect Branch Tracking enabled (CONFIG_X86_CET=y, CONFIG_X86_KERNEL_IBT=y) for kernel control-flow integrity.
User Shadow Stack: CET Shadow Stack for user-space enabled (CONFIG_X86_USER_SHADOW_STACK=y) for return address protection.

The security philosophy is hardware/driver bloat removal — not security regression.

🔬 9. Diagnostics, Tracing & Observability

The kernel deliberately retains a comprehensive diagnostic and tracing stack.

This is intentional: the project removes unnecessary runtime hardware support, while keeping the infrastructure needed to diagnose and profile the system.

🔍 Kernel Debug Infrastructure

CONFIG_DEBUG_KERNEL=y
CONFIG_DEBUG_MISC=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_INFO_BTF=y
CONFIG_DEBUG_INFO_BTF_MODULES=y
CONFIG_DYNAMIC_DEBUG=y
CONFIG_DYNAMIC_DEBUG_CORE=y

📊 Scheduler Diagnostics

CONFIG_SCHED_INFO=y
CONFIG_SCHEDSTATS=y
CONFIG_LOCK_DEBUGGING_SUPPORT=y

Heavy lock validation facilities are disabled:

# CONFIG_PROVE_LOCKING is not set
# CONFIG_LOCK_STAT is not set
# CONFIG_DEBUG_SPINLOCK is not set
# CONFIG_DEBUG_MUTEXES is not set
# CONFIG_DEBUG_ATOMIC_SLEEP is not set

This provides scheduler/diagnostic visibility without enabling the heavier debugging stack.

🔎 Ftrace

The kernel retains a full Ftrace suite:

CONFIG_FTRACE=y
CONFIG_FUNCTION_TRACER=y
CONFIG_FUNCTION_GRAPH_TRACER=y
CONFIG_DYNAMIC_FTRACE=y
CONFIG_DYNAMIC_FTRACE_WITH_REGS=y
CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS=y
CONFIG_DYNAMIC_FTRACE_WITH_ARGS=y
CONFIG_STACK_TRACER=y
CONFIG_FTRACE_SYSCALLS=y
CONFIG_KPROBE_EVENTS=y
CONFIG_UPROBE_EVENTS=y
CONFIG_BPF_EVENTS=y
CONFIG_DYNAMIC_EVENTS=y

This enables advanced runtime tracing and profiling with tools like ftrace, perf, bpftrace, and trace-cmd.

🧭 ORC Unwinder

CONFIG_UNWINDER_ORC=y
# CONFIG_UNWINDER_FRAME_POINTER is not set

The ORC unwinder provides efficient and accurate kernel stack unwinding for perf and ftrace call stacks.

🚨 Hung Task / Lockup Detection

CONFIG_LOCKUP_DETECTOR=y
CONFIG_SOFTLOCKUP_DETECTOR=y
CONFIG_HARDLOCKUP_DETECTOR=y
CONFIG_DETECT_HUNG_TASK=y
CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=120

The kernel detects:

soft lockups (NMI watchdog)
hard lockups (perf-based HARDLOCKUP_DETECTOR_PERF)
hung tasks (120 second default timeout)

🔍 14. Post-Boot Verification

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

Kernel version

$ uname -a
Linux debian 7.2.8-ryzen9 #ryzen9 SMP PREEMPT_DYNAMIC Thu Oct  1 23:31:21 CEST 2026 x86_64 GNU/Linux

CPU topology

$ 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

AMD P-State

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

Preemption

$ sudo dmesg | grep -i "preempt"
[    0.032333] Dynamic Preempt: full
[    0.032388] rcu: Preemptible hierarchical RCU implementation.

CONFIG_PREEMPT_BUILD=y, CONFIG_PREEMPT=y, CONFIG_PREEMPT_DYNAMIC=y

NO_HZ

$ grep -E "CONFIG_NO_HZ_(IDLE|FULL)" /boot/config-$(uname -r)
CONFIG_NO_HZ_IDLE=y
# CONFIG_NO_HZ_FULL is not set

RCU

$ grep -E "CONFIG_RCU_(BOOST|NOCB_CPU)" /boot/config-$(uname -r)

No output expected — RCU_BOOST and RCU_NOCB_CPU are not set in this configuration.

TCP BBR

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

Zswap

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

AMDGPU

$ sudo dmesg | grep -i amdgpu | head -30
[    0.000000] Command line: BOOT_IMAGE=/vmlinuz-7.2.8-ryzen9 root=UUID=b6580fbd-f315-4df0-b934-da60ed1467e3 ro amdgpu.ppfeaturemask=0xffffffff zswap.enabled=1 zswap.compressor=lzo
[    0.009148] Kernel command line: BOOT_IMAGE=/vmlinuz-7.2.8-ryzen9 root=UUID=b6580fbd-f315-4df0-b934-da60ed1467e3 ro amdgpu.ppfeaturemask=0xffffffff zswap.enabled=1 zswap.compressor=lzo
[    4.859534] amdgpu: unknown parameter 'si_support' ignored
[    4.860323] amdgpu: unknown parameter 'cik_support' ignored
[    4.866799] amdgpu: Virtual CRAT table created for CPU
[    4.867606] amdgpu: Topology: Add CPU node
[    4.868422] amdgpu: Overdrive is enabled, please disable it before reporting any bugs unrelated to overdrive.
[    4.869268] amdgpu 0000:0d:00.0: enabling device (0006 -> 0007)
[    4.870087] amdgpu 0000:0d:00.0: initializing kernel modesetting (SIENNA_CICHLID 0x1002:0x73A5 0x1002:0x0E3A 0xC0).
[    4.870907] amdgpu 0000:0d:00.0: register mmio base: 0xFC900000
[    4.871664] amdgpu 0000:0d:00.0: register mmio size: 1048576
[    4.876104] amdgpu 0000:0d:00.0: detected ip block number 0 <common_v1_0_0> (nv_common)
[    4.876820] amdgpu 0000:0d:00.0: detected ip block number 1 <gmc_v10_0_0> (gmc_v10_0)
[    4.877510] amdgpu 0000:0d:00.0: detected ip block number 2 <ih_v5_0_0> (navi10_ih)
[    4.878172] amdgpu 0000:0d:00.0: detected ip block number 3 <psp_v11_0_0> (psp)
[    4.878825] amdgpu 0000:0d:00.0: detected ip block number 4 <smu_v11_0_0> (smu)
[    4.879470] amdgpu 0000:0d:00.0: detected ip block number 5 <dce_v1_0_0> (dm)
[    4.880098] amdgpu 0000:0d:00.0: detected ip block number 6 <gfx_v10_0_0> (gfx_v10_0)
[    4.880712] amdgpu 0000:0d:00.0: detected ip block number 7 <sdma_v5_2_0> (sdma_v5_2)
[    4.881301] amdgpu 0000:0d:00.0: detected ip block number 8 <vcn_v3_0_0> (vcn_v3_0)
[    4.881866] amdgpu 0000:0d:00.0: detected ip block number 9 <jpeg_v3_0_0> (jpeg_v3_0)
[    4.882420] amdgpu 0000:0d:00.0: Fetched VBIOS from VFCT
[    4.882943] amdgpu 0000:0d:00.0: [drm] ATOM BIOS: 113-D4124100-102, build: 604554  , ver: 020.001.000.071.018202, 2022/03/10
[    4.885161] amdgpu 0000:0d:00.0: vgaarb: deactivate vga console
[    4.885165] amdgpu 0000:0d:00.0: Trusted Memory Zone (TMZ) feature disabled as experimental (default)
[    4.885199] amdgpu 0000:0d:00.0: MEM ECC is not presented.
[    4.885205] amdgpu 0000:0d:00.0: SRAM ECC is not presented.
[    4.885215] amdgpu 0000:0d:00.0: vm size is 262144 GB, 4 levels, block size is 9-bit, fragment size is 9-bit
[    4.885226] amdgpu 0000:0d:00.0: VRAM: 16368M 0x0000008000000000 - 0x00000083FEFFFFFF (16368M used)
[    4.885232] amdgpu 0000:0d:00.0: GART: 512M 0x0000000000000000 - 0x000000001FFFFFFF

The si_support/cik_support "ignored" warnings confirm that legacy SI/CIK support is correctly disabled in the config (# CONFIG_DRM_AMDGPU_SI is not set). VRAM: 16368M with full ReBAR mapping.

Device Memory Cgroup

$ grep CONFIG_CGROUP_DMEM /boot/config-$(uname -r)
CONFIG_CGROUP_DMEM=y

BPF JIT

$ grep -E "CONFIG_BPF_JIT" /boot/config-$(uname -r)
CONFIG_BPF_JIT=y
CONFIG_BPF_JIT_DEFAULT_ON=y
# CONFIG_BPF_JIT_ALWAYS_ON is not set

sched-ext

$ cat /sys/kernel/sched_ext/state 2>/dev/null
disabled

disabled means the mechanism is available but no external BPF scheduler is currently loaded. Use scx_bpfland or scx_rusty to activate.

ORC Unwinder

$ grep CONFIG_UNWINDER_ORC /boot/config-$(uname -r)
CONFIG_UNWINDER_ORC=y

GPU / ReBAR

$ sudo dmesg | grep -Ei "amdgpu|BAR|Resizable"
[    4.885241] amdgpu 0000:0d:00.0: [drm] Detected VRAM RAM=16368M, BAR=16384M

🧪 15. Kernel Configuration Verification

The configuration embedded in the installed kernel can be extracted directly from the Debian package:

$ dpkg-deb --fsys-tarfile linux-image-6.19.14-ryzen9_*.deb \
  | tar -x ./boot/config-6.19.14-ryzen9 -O \
  | grep -E "CONFIG_(X86_NATIVE_CPU|NR_CPUS|PREEMPT|NO_HZ|BPF_JIT|CGROUP_DMEM|DRM_AMDGPU|HSA_AMD)"
CONFIG_NO_HZ_IDLE=y
CONFIG_PREEMPT_BUILD=y
CONFIG_PREEMPT=y
CONFIG_PREEMPT_DYNAMIC=y
CONFIG_BPF_JIT=y
CONFIG_BPF_JIT_DEFAULT_ON=y
CONFIG_NR_CPUS=32
CONFIG_X86_NATIVE_CPU=y
CONFIG_DRM_AMDGPU=m
CONFIG_HSA_AMD=y
CONFIG_CGROUP_DMEM=y

This allows the packaged kernel to be verified independently of the source-tree configuration.

🖥️ Workstation Hardware Specs

🐧 Kernel and Toolchain

Element	Value
Kernel	7.2.8-ryzen9
Model	SMP PREEMPT_DYNAMIC
Base Distribution	Debian 13
Compiler	GCC 14.2.0
Target Architecture	Zen 3
Grub	`GRUB_CMDLINE_LINUX_DEFAULT="amdgpu.ppfeaturemask=0xffffffff zswap.enabled=1 zswap.compressor=lzo"`

📦 Build Dependencies

sudo apt update && sudo apt install -y build-essential gcc-14 g++-14 fakeroot bc bison flex zstd \
  libdw-dev libelf-dev libssl-dev libncurses-dev dwarves debhelper rsync python3 ccache curl jq patch kmod perl mawk tar xz-utils git

Paquete	Versión
`build-essential`	`12.12`
`gcc-14`	`14.2.0-19`
`g++-14`	`14.2.0-19`
`fakeroot`	`1.37.1.1-1`
`bc`	`1.07.1-4`
`bison`	`2:3.8.2+dfsg-1+b2`
`flex`	`2.6.4-8.2+b4`
`zstd`	`1.5.7+dfsg-1`
`libdw-dev`	`0.192-4`
`libelf-dev`	`0.192-4`
`libssl-dev`	`3.5.7-1~deb13u2`
`libncurses-dev`	`6.5+20250216-2`
`dwarves`	`1.30-1`
`debhelper`	`13.24.2`
`rsync`	`3.4.1+ds1-5+deb13u4`
`python3`	`3.13.5-1`
`curl`	`8.14.1-2+deb13u5`
`jq`	`1.7.1-6+deb13u4`
`patch`	`2.8-2`
`kmod`	`34.2-2`
`perl`	`5.40.1-6+deb13u1`
`mawk`	`1.3.4.20250131-1`
`tar`	`1.35+dfsg-3.1`
`xz-utils`	`5.8.1-1+deb13u1`
`git`	`1:2.47.3-0+deb13u1`

🧠 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
Part	100-100000059WOF

💾 Memory RAM

Parameter	Value
Total Capacity	128 GB
Configuration	4 × 32 GB
Type	DDR4
Speed	3600 MT/s
CL	18-22-22-42
Voltage	1.35v
Channels	Dual Channel
ECC	No
Model	G.Skill F4-3600C18D-64GTZN
EAN	4713294224835

🎮 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	Versión	Driver
Kernel	`7.2.8-ryzen9`	Custom Linux kernel
AMDGPU / DRM	`3.64`	AMDGPU — AMD Radeon RX 6950 XT / NAVI21
Vulkan	`1.4.309`	RADV — Mesa `25.0.7-2+deb13u1`
OpenCL	`3.0`	RustiCL — Mesa `25.0.7-2+deb13u1`
OpenCL C	`1.1`	Device OpenCL C Version
OpenGL	`4.6`	radeonsi — Mesa `25.0.7-2+deb13u1`, LLVM `19.1.7`
VRAM	`16368 MiB`	GDDR6, 256-bit
Resizable BAR	`16 GB`	BAR 0: 16 GB
GTT	`32109 MiB`	AMDGPU
GART	`512 MiB`	AMDGPU

🧩 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
DNR/SNR	116 dB
PCI ID	`1102:0012`
Driver	ALSA (`snd_ca0132`)
Hi-res Audio	Enabled `32 bits / 192kHz`
Speakers	Edifier M60

🌐 Network — Ethernet

Component	Details
Controller	Intel I211 Gigabit
Bus Interface	PCI Express v2.1 (2.5 GT/s)
IEEE Standards	802.3az (EEE), 1588 / 802.1AS, 802.1Qav
Speeds	10/100/1000 Mbps (Auto-negotiation)
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)

🥶 Cooling

Component	Details	Store
AIO	Fractal Celsius+ Prisma S36	Amazon
Fan front	3x Noctua NF-P12 redux-1700	Amazon
Fan top	2x Noctua NF-A14 PWM	Amazon
Fan rear	1x Noctua NF-F12 PWM	Amazon
Thermal Paste	Noctua NT-H2	Amazon
Fan hub	Noctua NA-FH1	Amazon

Name		Name	Last commit message	Last commit date
.github		.github
changelogs		changelogs
configs		configs
patchs		patchs
LICENSE		LICENSE
README.md		README.md

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