Public bug reported:
Binary package hint: linux-source-2.6.22
Repeatable: YES!
How to reproduce:
1.) openiscsi+iscsitarget: export and reimport sparse disk image locally.
2.) Or: just do "mount -o loop img mntpt" (tried reiserfs and ext3 in the
image, the image itself is located on ext3).
Then run "rsync -a --stats /usr mntpt/." and you will see the following
symptoms:
1.) harddisk is often idle and CPU is 100% waiting for IO (although the
harddisk is doing NOTHING).
2.) reads/writes happen faster if one creates other disk IO (starting the
browser, doing a "sync").
Tried and verified successfully on:
1.) amd64 platform
2.) AMD Opteron
3.) Athlon XP
4.) Intel Centrino
with Ubuntu Gutsy.
# uname -a
Linux cccc-laptop 2.6.22-14-generic #1 SMP Tue Feb 12 02:46:46 UTC 2008 x86_64
GNU/Linux
** Affects: linux-source-2.6.22 (Ubuntu)
Importance: Undecided
Status: New
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loopback-mounted disk images behave abnormally
https://bugs.launchpad.net/bugs/217470
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