buffer cache hash table size

[Touko Korpela]

I noticed following when telling kernel to use only 63.5 MB of total
64 MB memory.
Buffer cache is four times smaller, while others remain the same.
(In 2.6.0-test3-bk1 parsing of mem= has changed and different caches are
used. There PID hash table shrinks to half while other caches remain same.)
Motherboard is old K6/Pentium which only caches 63.5 of memory.

No memory size specified:

Memory: 62244k/65536k available (1365k kernel code, 2904k reserved, 333k data, 268k init, 0k highmem)
Dentry cache hash table entries: 8192 (order: 4, 65536 bytes)
Inode cache hash table entries: 4096 (order: 3, 32768 bytes)
Mount cache hash table entries: 512 (order: 0, 4096 bytes)
Buffer cache hash table entries: 4096 (order: 2, 16384 bytes)
Page-cache hash table entries: 16384 (order: 4, 65536 bytes)

mem=65024k specified:

Memory: 61736k/65024k available (1365k kernel code, 2900k reserved, 333k data, 268k init, 0k highmem)
Dentry cache hash table entries: 8192 (order: 4, 65536 bytes)
Inode cache hash table entries: 4096 (order: 3, 32768 bytes)
Mount cache hash table entries: 512 (order: 0, 4096 bytes)
Buffer cache hash table entries: 1024 (order: 0, 4096 bytes)
Page-cache hash table entries: 16384 (order: 4, 65536 bytes)
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