Messages in this thread | | | Date | Thu, 1 Aug 2002 10:10:10 +0200 | From | Jens Axboe <> | Subject | Re: Linux v2.4.19-rc5 |
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On Thu, Aug 01 2002, Marcelo Tosatti wrote: > > On Thu, 1 Aug 2002, Jens Axboe wrote: > > > On Thu, Aug 01 2002, Marcelo Tosatti wrote: > > > <akpm@zip.com.au> (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.
You are right, that would be ugly. Should only be the last resort.
> > 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.
It just 'feels' like the sort of change that might have odd side effects.
-- Jens Axboe
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