Public bug reported:
Binary package hint: ureadahead
After upgrading to maverick, I noticed boot time was longer than with lucid,
about 42s in maverick instead of 30s in lucid.
>From the bootchart it seemed ureadahead was not properly working. It showed
>continuous hdd activity.
>From the ureadahead changelog I saw buffer size had been decreased to 8MB.
>Therefore I rebuilt ureadahead with the previous 128MB/num_cpus. That gave a
>good boot speed again, 28.21s, slightly faster than lucid.
I also built a version with fixed 8MB buffer, independent of num_cpus. That
gives about the same result as 128MB/num_cpus. Was the division by num_cpus
intended?
With the original maverick ureadahead the pack file was about 480kbyte, with
128/num_cpus the pack file was about 1 MB, with 8MB pack file is 993kB.
Processor is an Intel T7500, dual core.
File system is ext 4 on lvm on a laptop hdd (320GB, 7200 rpm).
I also dumped the pack files and counted the number of files (grep bytes on the
dump):
maverick original: 1676 files
with buffer 128MB/num_cpus: 3413 files
with buffer 8MB fixed: 3368 files
ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: ureadahead 0.100.0-8
ProcVersionSignature: Ubuntu 2.6.35-22.34-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
Architecture: amd64
Date: Wed Oct 13 18:06:26 2010
PackDump: Error: command ['ureadahead', '--dump'] failed with exit code 4:
ureadahead:/var/lib/ureadahead/pack: Permission denied
ProcEnviron:
PATH=(custom, user)
LANG=en_US.utf8
SHELL=/bin/bash
SourcePackage: ureadahead
** Affects: ureadahead (Ubuntu)
Importance: Undecided
Status: New
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ureadahead buffer size seems too small
https://bugs.launchpad.net/bugs/660043
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