Setting elevator=noop solve the problem for me, the write speed to usb stick is 
stable, about 5-6 mb/sec all the time. But now sometimes I see the HDD 
performance problems while system write to usb.
Maybe try other elevator types?
Completely Fair Queuing — elevator=cfq
Deadline — elevator=deadline
NOOP — elevator=noop
Anticipatory — elevator=as

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file transfers on USB flash key (pendrive) are slowing down with time
https://bugs.launchpad.net/bugs/197762
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