Messages in this thread | | | Date | Wed, 12 Jul 2000 16:32:23 +0200 | From | nob@thinstuf ... | Subject | page cache size |
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i would like to change the page cache size for some fs/performance tests under 2.4.0-test3/i386.
does anyone know how 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.
there is a (unclear) comment that indicates (in my opinion :) that page size _will_ probaly increase in future.
so that is what i've tried in order to get a page cache size of - let's say 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))
after rebuilding the kernel and rebooting the system hangs after mounting root (ext2). no messages.
thx, Norbert
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