Public bug reported:
There are several ways to demonstrate this problem. This is an easy one:
1. On a disk with lots of space, create a large file X of size ~8GB
2. Issue the command "split -b 4000m X"
This will keep the disk occupied nicely. Until the job finishes, even a
dual-core machine will respond erratically. Some jobs will be fine,
while others will freeze for long periods of time. I believe that the
difference between freezing and non-freezing jobs is that the jobs that
are freezing are being greatly starved of even small amounts of time
needed to perform disk accesses.
I experience this issue on 64-bit gutsy on a dual-core system with a
500GB drive that is about 50% full.
** Affects: ubuntu
Importance: Undecided
Status: New
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[gutsy kernel disk scheduler] tasks that use disk heavily starve other tasks of
disk access
https://bugs.launchpad.net/bugs/176370
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