Again: this time I simultaneously wrote two 3GB files on top af an ext3
fs on top of a 8GB pendrive, ...
------------------ noop ------------------
elapsed: 11' 52", high iowait but no system slowdown, it's quite good.
avg-cpu: %user %nice %system %iowait %steal %idle
8.01 0.00 6.61 83.31 0.00 2.65
------------------ anticipatory ------------------
elapsed: 11' 56", high iowait but no system slowdown, it's quite good.
avg-cpu: %user %nice %system %iowait %steal %idle
6.51 0.00 6.01 82.96 0.00 5.16
------------------ deadline ------------------
elapsed: 11' 58", high iowait but no system slowdown, it's quite good.
avg-cpu: %user %nice %system %iowait %steal %idle
6.87 0.02 7.58 79.64 0.00 6.54
------------------ cfq ------------------
elapsed: 19' 50", visible system slowdown with many app, but it's still usable.
avg-cpu: %user %nice %system %iowait %steal %idle
5.44 0.00 6.39 82.24 0.00 6.30
-------------------------------------------
This time in iostat I can't see significative difference between cases,
but the system become slow and unresponsive with cfq...
Now, I'm much more disappointed...
--
elevator=cfq (default) cause starvation
https://bugs.launchpad.net/bugs/381300
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