Re: -mmX 4G patches feedback [numbers: how much performance impact]

[Andrea Arcangeli]

On Tue, Apr 06, 2004 at 10:25:48PM +0200, Andrea Arcangeli wrote:
> I'm using DOUBLE. However I won't post the quips, I draw the graph
> showing the performance for every working set, that gives a better
> picture of what is going on w.r.t. memory bandwidth/caches/tlb.

Here we go:

	http://www.kernel.org/pub/linux/kernel/people/andrea/misc/31-44-100-1000/31-44-100-1000.html

the global quips you posted indeed had no way to account for the part of
the curve where 4:4 badly hurts. details in the above url.

Please cross check my results on your hardware (I used a 2.5Ghz xeon, 1G
of ram, and benchs run fresh after boot with all ram still free).
Numbers are perfectly reproducible for me, and they make perfect sense
too.  2.6.5-aa4 is the same as 2.6.5-aa3 for this benchmark (though I'll
upload 2.6.5-aa4 in a few hours).
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