decrease L2 cache size used by Linux?

[Al Boldi]

Guerreiro da Luz wrote:
> Am benchmarking dumb matrix multiplication in trying to perceive
> performance drop in case when matrix cannot fit in L2 cache.  However,
> on my machine L2 cache is large - 2MB, so 512x512 matrix of double
> numbers is needed to fill the cache, and in that case multiplication
> is taking rather long time.  So I'm wondering is there a way to
> control (decrease) L2 cache size used by Linux?  Apologies if question
> inappropriate for the list.

You may want to turn off randomization,
 
echo 0 > /proc/sys/kernel/randomize_va_space
echo 1 > /proc/sys/vm/vdso_enabled

And see if that helps.


Thanks!

--
Al

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