Re: Linux v2.4.19-rc5

From: Marcelo Tosatti (
Date: Thu Aug 01 2002 - 02:14:01 EST

On Thu, 1 Aug 2002, Jens Axboe wrote:

> On Thu, Aug 01 2002, Marcelo Tosatti wrote:
> > <> (02/08/01 1.663)
> > [PATCH] disable READA
> Since -rc5 is not to be found yet, I don't know what version of this
> made it in. Is READA just being disabled on SMP, or was it the general
> #if 0 change that got included?

Its being disabled on UP and SMP. I dont like having such readahead IO
mode working only for UP.

> I'm asking since plain disabling READA might have nasty performance
> effects. Andrew, I bet you did some numbers on this, care to share?

If thats true (the performance effects) I'll release -final with IMO not
very coherent READA semantics :)

Anyway, lets wait for the numbers.

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