---
- branch: MAIN
  date: Mon Jun 21 21:18:47 UTC 2021
  files:
  - new: '1.32'
    old: '1.31'
    path: src/sys/stand/efiboot/boot.c
    pathrev: src/sys/stand/efiboot/boot.c@1.32
    type: modified
  - new: '1.14'
    old: '1.13'
    path: src/sys/stand/efiboot/efiblock.c
    pathrev: src/sys/stand/efiboot/efiblock.c@1.14
    type: modified
  - new: '1.6'
    old: '1.5'
    path: src/sys/stand/efiboot/efiblock.h
    pathrev: src/sys/stand/efiboot/efiblock.h@1.6
    type: modified
  id: 20210621T211847Z.8a89ec626cbe11f45f016f68bb0b52d3c651c86a
  log: |
    efiboot: Add readahead support.

    Reading data through libsa file-systems ends up breaking block I/O
    accesses into very small (512-byte or 2048-byte) accesses. This can be
    very inefficient, and causes Ampere eMAG w/ BMC image direction to take
    _minutes_ to load the install image and kernel. So slow in fact that
    the default watchdog timeout will fire before it finishes.

    So, when loading big files, optimistically read ahead up to 64KB of data.
    Brings the time to boot the install ISO down to around 40 seconds -- still
    not ideal but way better than before.
  module: src
  subject: 'CVS commit: src/sys/stand/efiboot'
  unixtime: '1624310327'
  user: jmcneill