This is another test: this time I wrote a 6GB file on top af an ext3 fs
on top of a 8GB pendrive...
This 8GB pendrive is slightly faster than the other one...
------------------ noop ------------------
elapsed: 10' 38", no slowdown, all good...
avg-cpu: %user %nice %system %iowait %steal %idle
13.75 0.01 9.10 51.23 0.00 26.33
------------------ anticipatory ------------------
elapsed: 09' 46", no slowdown, all good...
avg-cpu: %user %nice %system %iowait %steal %idle
19.22 0.01 13.04 43.32 0.00 24.88
------------------ deadline ------------------
elapsed: 09' 45", no slowdown, all good...
avg-cpu: %user %nice %system %iowait %steal %idle
18.90 0.02 13.20 46.88 0.00 21.40
------------------ cfq ------------------
elapsed: 09' 39", no slowdown, all good...
avg-cpu: %user %nice %system %iowait %steal %idle
18.56 0.01 12.58 43.52 0.00 25.65
-------------------------------------------
Now, I'm a bit disappointed...
Some time it (cfq) work very well, some time it's a disaster!
--
elevator=cfq (default) cause starvation
https://bugs.launchpad.net/bugs/381300
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