Douglas Teles ccb2f7d702 Linux kernel and system-level performance optimization for RK3326 ...

Kernel config:
- SCHED_AUTOGROUP=n: Disable task auto-grouping (causes latency spikes)
- DRM_PANFROST=y (was m): Build GPU driver into kernel (faster probe)
- DRM_FBDEV_EMULATION=n: Remove legacy framebuffer overhead
- PROFILING=n: Disable kernel profiling (CPU overhead)
- MAGIC_SYSRQ=n: Remove debug code path
- PAGE_REPORTING=n: Disable page reporting overhead
- BTRFS_FS=n: Remove 300KB+ kernel bloat (unused)
- NTFS/NTFS3=n: Remove Windows FS support (unused)
- BRIDGE=n: Remove network bridging (unused)

Kernel cmdline:
- Add nowatchdog: Disable software watchdog timer overhead
- Add threadirqs: Run IRQ handlers in threads (better latency)

Sysctl tuning:
- vm.laptop_mode: 5→0 (was causing I/O batching latency spikes)
- vm.dirty_writeback_centisecs: 1500→500 (15s→5s, prevents frame stutters)
- vm.vfs_cache_pressure: 200→50 (stop aggressive cache eviction on 1GB RAM)
- vm.dirty_ratio: 5→10 (allow more dirty memory before sync)
- vm.dirty_background_ratio: 2→5 (less aggressive background writeback)

Systemd:
- journald: Set Storage=volatile (RAM-only, zero SD card writes)

2026-04-17 18:57:17 -03:00

..

ArchR

Linux kernel and system-level performance optimization for RK3326

2026-04-17 18:57:17 -03:00

ROCKNIX/packages

systemd: reduce default service stop timeout to 5s

2026-04-17 16:45:58 -03:00