2.6.21.1 - 97% wait time on IDE operations

Hi folks, 

I was trying to get answer to my question around, but no one knows.
I do have DMA turned on, etc, yet - on extensive harddrive operations wait 
time is 90+% , which means that machine is waiting, rather than doing 
something meanwhile. (I guess). 
Can someone describe to me , in more detail why is that happening, and what 
steps should I consider to avoid it ? I couldn't find any answers that would 
have help me on net.

thanks.
-- 
Vercetti
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