Excessive buffer cache hash size in 2.2

From: Andi Kleen (ak@suse.de)
Date: Fri Jul 28 2000 - 00:37:06 EDT

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    I recently noticed that on a 2.2.16 kernel on a 128MB machine:

    Jul 27 05:05:38 fred kernel: Buffer cache hash table entries: 131072 (order 7, 512k)

    Could someone give a rationale for using 1/256 of a machine's memory for the buffer
    hash table ?
    Why does it need to be that big? (especially given the cache misses such a huge
    table causes)

    -Andi

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