How to increase the page cache size

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i would like to increase the page cache size for some
cramfs-compression-performance tests (i386)

does anyone know the right way to do that??

PAGE_SIZE is defined in asm/page.h as (1UL << PAGE_SHIFT)
PAGE_SHIFT for i386 is 12, so PAGE_SIZE is 4096
in linux/pagemap.h PAGE_CACHE_SIZE is defined as PAGE_SHIFT.

so that is what i've tried in order to get a page cache size
of 8192 in linux/pagemap.h:

original version:
#define PAGE_CACHE_SHIFT PAGE_SHIFT
#define PAGE_CACHE_SIZE PAGE_SIZE
#define PAGE_CACHE_MASK PAGE_MASK
...

my try:
#define PAGE_CACHE_SHIFT 13
#define PAGE_CACHE_SIZE (1UL << PAGE_CACHE_SHIFT)
#define PAGE_CACHE_MASK (~(PAGE_CACHE_SIZE-1))

the kernel is booting fine, but fails to mount root.
any hints ???

thx a lot,
Nob,

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