mtk-bwmod v1.8

[v1.8] — System File Overlay (Init Layer)

Added

New tuning layer via Magisk system file replacement — applied by Android init system, runs before service.sh and before user space starts.

system/etc/init/mtk-bwmod.rc — Android Init Script

• Processed by Android init daemon (not Magisk)
• Runs at two stages:
  • on post-fs-data — early boot, kernel params before network up
  • on property:sys.boot_completed=1 — after modules loaded (BBR, conntrack)
• Covers: TCP core, UDP buffers, socket core, routing, conntrack, IPv6
• Universal: Android 8+ on all MTK devices

system/etc/sysctl.d/99-mtk-bwmod.conf — sysctl.d Fallback

• Applied by init sysctl service on ROMs that process /etc/sysctl.d/
• Mirrors init.rc settings as a redundancy layer
• Includes: TCP, UDP, buffers, conntrack, routing, IPv6

Boot Layer Architecture

Android init
  ├─ post-fs-data        ← [NEW v1.8] mtk-bwmod.rc (early kernel params)
  ├─ sysctl.d            ← [NEW v1.8] 99-mtk-bwmod.conf (fallback)
  └─ boot_completed
       ├─ BBR + buffers  ← [NEW v1.8] mtk-bwmod.rc (module-dependent)
       └─ Magisk service.sh (22 sections, fine tuning + radio + WiFi)

Technical Details

mtk-bwmod.rc — on post-fs-data (early):

• TCP fastopen, SACK, window scaling, ECN, keepalive, notsent_lowat
• UDP rmem/wmem_min, port range 1024-65535
• Socket: somaxconn=8192, netdev_budget=600, backlog=32768, rps_flow=32768
• Routing: rp_filter, no redirects, no source routing
  mtk-bwmod.rc — on property:sys.boot_completed=1 (late):
• BBR congestion control (tcp_bbr.ko must be loaded)
• TCP buffers: 64MB rmem/wmem
• Conntrack: max=2,000,000, TCP_EST=600s, UDP=30s
  99-mtk-bwmod.conf — sysctl.d:
• Full mirror of init.rc params as fallback
• Applied by sysctl --system during init
• And nothing.