I've been running with the "anticipatory" scheduler for a long time now.
The same bug drove me to experiment with the schedulers. Responsiveness
under heavy I/O is much better than with CFQ

Every once in a while (when changing kernels) I try CFQ again, without
luck. I know CFQ has a few kernel params that we can play with but
that's beyond my knowledge unfortunately so I just stuck to using
"anticipatory".

-- 
CFQ may not be the right choice of i/o scheduler for the most common desktop 
systems
https://bugs.launchpad.net/bugs/427210
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