---
- branch: MAIN
  date: Tue Dec  3 04:57:25 UTC 2019
  files:
  - new: '1.43'
    old: '1.42'
    path: src/sys/arch/x86/x86/bus_space.c
    pathrev: src/sys/arch/x86/x86/bus_space.c@1.43
    type: modified
  id: 20191203T045725Z.fc7e6ad83200c0739348166e10059f36eb5589ae
  log: |
    Skip fences in bus_space_barrier on I/O space.

    I/O operations are issued in program order.  Not that I/O operations
    are usually a performance bottleneck anyway, but maybe it is slightly
    cheaper to avoid stalling on store buffers or pending loads, and
    there's very little cost to the skipping criterion here.
  module: src
  subject: 'CVS commit: src/sys/arch/x86/x86'
  unixtime: '1575349045'
  user: riastradh