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    DateSun, 4 Jun 2006 18:02:08 -0700
    FromAndrew Morton <>
    SubjectRe: readahead benchmark
    On Mon, 5 Jun 2006 08:28:07 +0800
    Fengguang Wu <fengguang.wu@gmail.com> wrote:
    
    > On Sun, Jun 04, 2006 at 01:50:11PM -0700, Andrew Morton wrote:
    > > readahead-kconfig-options.patch
    > [...] 
    > >  It's early days yet - needs heaps more performance testing.  The results
    > >  from "Linux Portal" <linportal@gmail.com> were discouraging.
    > 
    > I found this mail from the lkml archive, did you happen to have more
    > results?
    > 
    
    Sorry, I had the wrong tester.  Voluspa <lista1@comhem.se>: "Conclusion: On
    _this_ machine, with _these_ operations, Adaptive Readahead in its current
    incarnation and default settings is a _loss_."
    
    > 
    > There is an interesting (although simple) benchmark of Wu's adaptive
    > readahead patchset (v12) together with graphs here:
    > 
    >   http://linux.inet.hr/adaptive_readahead_benchmark.html
    > 
    > In that simple test it definitely looks promising (3x speedup).
    
    That's postgreql again.
    
    We know there's a problem at present with postgresql.  Has anyone tried to
    fix it, without going and rewriting everything?
    -
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