Comment 2 for bug 338822

I cannot confirm your observation. I've 'bootcharted' two systems and with both sreadahead was slower than not using preloading at all - readahead-list was faster [I've stopped before GDM loading for pack file generation and used that list with readahead].

Sys 1 (AMD Opteron 144 @ 2.65GHz, 2GB RAM, 7200rpm disk):
- pack file: 733 files with 73.456.165 bytes
* no (s)readahead: 18.0s
* readahead: 17.4s
* sreadahead: 18.4s
* sreadahead started with --no-fork: 19.3s

Sys 2 (Intel Core Duo T2400 @ 1.83GHz, 2GB RAM, 5400rpm disk):
- pack file: 829 files with 57.408.165 bytes
* no (s)readahead: 23.1s
* readahead: 21.9s
* sreadahead: 24.6s
* sreadahead started with --no-fork: 24.3s

The gap is not big but it's there.

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2.6.31-9-generic (Core Duo system used -7-generic)

readahead:
  Installed: 1:0.20050517.0220-1ubuntu5

sreadahead:
  Installed: 1.0-2