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SubjectRe: Calculating kernel logical address ..
On Monday 09 September 2002 20:00, Richard B. Johnson wrote:
> For some reason, (claimed performance reasons) user-mode code
> has to be able to get data directly from hardware with no
> intervening copy operation. I think any claimed advantage goes
> away when you look at the overhead necessary for user-mode
> code to sleep before, and awaken after, the DMA operation but
> often marketing departments make those decisions.

Pfft. Try turning off ide dma and see what happens.

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