On my notebook (fujitsu-siemens amilopro v3505):
writing large file on a pendrive:
------------------ noop ------------------
elapsed: 19' 31"
avg-cpu: %user %nice %system %iowait %steal %idle
4.77 0.00 14.39 49.16 0.00 35.82
no slowdown, all good...
------------------ anticipatory ------------------
elapsed: 19' 24"
avg-cpu: %user %nice %system %iowait %steal %idle
4.04 0.00 12.87 53.54 0.00 31.16
minor slodown moving windows or writing to the internal disk.
------------------ deadline ------------------
elapsed: 19' 44"
avg-cpu: %user %nice %system %iowait %steal %idle
6.76 0.00 10.38 46.15 0.00 37.59
minor slodown moving windows or writing to the internal disk.
------------------ cfq ------------------
Elapsed: 27' 35"
avg-cpu: %user %nice %system %iowait %steal %idle
0.59 0.00 10.12 88.76 0.00 1.29
everything is slow, and some time locked...
-------------------------------------------
What I can say is that at home, yesterday, I never
seen the iowait over 40%.
The fact that it does not happen on every pc explain why
cfq is the default...
--
elevator=cfq (default) cause starvation
https://bugs.launchpad.net/bugs/381300
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