FreeBSD SMPng Project

• SMPng work began in 2001

  • Present in FreeBSD 5.x, 6.x

• Several architectural goals

  • Adopt more threaded architecture
    • Threads represent possible kernel parallelism
    • Permit interrupts to execute as threads
  • Introduce various synchronization primitives
    • Mutexes, SX locks, rw locks, semaphores, CV's
  • Iteratively lock subsystems and slide Giant off

• Start with common dependencies

  • Synchronization, scheduling, memory allocation, timer events, ...