Re: cache limit

[Ihar 'Philips' Filipau]

Mike Fedyk wrote:
> On Tue, Aug 26, 2003 at 12:15:46PM +0200, Ihar 'Philips' Filipau wrote:
> >  If I have 1GB of memory and my applications for use only 16MB - it 
> > doesn't mean I want to fill 1GB-16MB with garbage like file my momy had 
> > viewed two weeks ago.
> >
> >  That's it: OS should scale for *application* *needs*.
> >
> >  Can you compare in your mind overhead of managing 1GB of cache with 
> > managing e.g. 16MB of cache?
>
> Ok, let's benchmark it.
>
> Yes, I can see the logic in your argument, but at this point, numbers are
> needed to see if or how much of a win this might be.

  [ I beleive you can see those thread about O_STREAMING patch. 
Not-caching was giving 10%-15% peformance boost for gcc on kernel 
compiles. Isn't that overhead? ]

  I will try to produce some benchmarktings tomorrow with different 
'mem=%dMB'. I'm afraid to confirm that it will make difference.
  But in advance: mantainance of page tables for 1GB and for 128MB of 
RAM are going to make a difference.

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