Using ionice -c3 in f13: system seems less responsive than under f12

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Hi:  My system spends a lot of its time processing video data, often 
with not much numerical processing involved - just remuxing or making an 
iso image.  atop often shows disk activity above 90%.  I do most of this 
using ionice -c3, (ie 'idle' scheduling) which is supposed to reduce 
impact on other tasks.  The man page says "The impact of idle io 
processes on  normal system activity should be zero"  and certainly 
under f12 that seemed at least approximately true; but under f13 
terminal response is often very sluggish when these tasks are running. 
Using kde 4.5.3, scheduling elevator=deadline (as in f12).

Am I expecting the right thing?  Does anyone else see this?

John P

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