Messages in this thread | | | Date | Fri, 10 May 2002 08:55:32 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: O_DIRECT performance impact on 2.4.18 (was: Re: [PATCH] 2.5.14 IDE 56) |
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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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