Looking around I found this bug:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/343371

He talk about reading big files, so I make some test and I found out that I 
have this problem too, even with noop:
This time (just reading a big file from a sata disk, not using a pendrive) the 
system become really unusable!

On the home pc, where I never seen problem writing large file using CFQ,
I don't have this problem too.

so, may be it's not a scheduler problem, but something else, and
changing the scheduler just alleviate the problem...

Is it possible?

How can I find out if it's a latency problem as described in 343371?

-- 
elevator=cfq (default) cause starvation
https://bugs.launchpad.net/bugs/381300
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