Re: [PATCH] mm - swap prefetch magnify

[Con Kolivas]

On Sat, 22 Oct 2005 19:41, Paolo Ciarrocchi wrote:
> On 10/22/05, Con Kolivas <kernel@xxxxxxxxxxx> wrote:
> > On Sat, 22 Oct 2005 11:20, Con Kolivas wrote:
> > > Testing has confirmed much larger prefetch values work well.
> >
> > Bah.. Sorry take this one instead. Just make sure that no matter how
> > little ram we have prefetch is enabled.
>
> Con,
> would you be so kind to post more information about the test you've done ?

My concern was to not cause a detriment to performance in any noticeable way. 
The prefetch sizes were tested on a number of machines with different speed 
hard drive / ram size combinations to ensure none of the default values ever 
caused any significant I/O wait, or that heavy memory requiring compiles took 
any longer to complete as these constantly need new ram allocations and I 
wanted to ensure that prefetching into ram didn't slow down those 
allocations. Furthermore, the time taken to actually prefetch the application 
is now more than 5 times faster because of the larger default prefetch 
values.

Cheers,
Con
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