On Fri, 10 May 2002, Lincoln Dale wrote:
>
> so O_DIRECT in 2.4.18 still shows up as a 55% performance hit versus no
> O_DIRECT. anyone have any clues?
Yes.
O_DIRECT isn't doing any read-ahead.
For O_DIRECT to be a win, you need to make it asynchronous.
Linus
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