Re: O_DIRECT performance impact on 2.4.18 (was: Re: [PATCH] 2.5.14

From: Alan Cox (
Date: Sat May 11 2002 - 13:26:03 EST

> > O_DIRECT is especially useful for applications which maintain their
> > own cache, e.g. a database. And adding Async to it is an even bigger
> > bonus (another Oracleism we did in PTX).
> The thing that has always disturbed me about O_DIRECT is that the whole
> interface is just stupid, and was probably designed by a deranged monkey
> on some serious mind-controlling substances [*].

Used with aio its extremely nice. Without the aio patches its a bit lacking
whenever readahead is useful

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This archive was generated by hypermail 2b29 : Tue May 14 2002 - 12:00:16 EST