Douglas Teles b0d73b4c1e Revert FRAME_POINTER and ZRAM zstd after deep research ...

FRAME_POINTER:
- ARM64 Kconfig unconditionally selects FRAME_POINTER (arch/arm64/Kconfig:136)
- Cannot be disabled regardless of defconfig value
- Overhead <1-2% on ARM64 (x29 designated as FP by ABI, STP saves FP+LR
  in single store queue slot)
- Restored to y to match kernel reality

ZRAM compression lzo-rle (reverted from zstd):
- zstd is 3-4x slower than lzo-rle on in-order Cortex-A35
- Estimated: lzo-rle ~350 MB/s vs zstd ~100 MB/s compress on A35
- Each 4KB page swap: 11us (lzo-rle) vs 40us (zstd)
- Under memory pressure during gaming, zstd causes frame stutters
- ROCKNIX deliberately uses lzo-rle on ALL in-order cores (A35/A53/A55)
  and only enables zstd on out-of-order big cores (A73/A76)
- The extra ~500MB virtual capacity from zstd's ratio is not worth the
  latency penalty for latency-sensitive gaming workloads

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-18 15:19:36 -03:00

..

ArchR

Revert FRAME_POINTER and ZRAM zstd after deep research

2026-04-18 15:19:36 -03:00

ROCKNIX/packages

systemd: reduce default service stop timeout to 5s

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