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    SubjectRe: hash table sizes
    jbarnes@sgi.com (Jesse Barnes) wrote:
    >
    > On Tue, Nov 25, 2003 at 01:07:41PM -0800, Andrew Morton wrote:
    > > the size of these tables dependent upon the number of dentries/inodes/etc
    > > which the system is likely to support. And that does depend upon the
    > > amount of direct-addressible memory.
    > >
    > >
    > > So hum. As a starting point, what happens if we do:
    > >
    > > - vfs_caches_init(num_physpages);
    > > + vfs_caches_init(min(num_physpages, pages_in_ZONE_NORMAL));
    > >
    > > ?
    >
    > Something like that might be ok, but on our system, all memory is in
    > ZONE_DMA...
    >

    Well yes, we'd want

    vfs_caches_init(min(num_physpages, some_platform_limit()));

    which on ia32 would evaluate to nr_free_buffer_pages() and on ia64 would
    evaluate to the size of one of those zones.

    If the machine has zillions of small zones then perhaps this will result in
    an undersized hashtable.
    -
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