Peter Chubb wrote:
>Hi folks,
> I couldn't get Reiserfs to work on large devices. I've tracked the
>problem down.
>
> When Reiserfs is mounted, it tries to allocate a chunk of memory for
>bitmaps using kmalloc. The largest chunk allocatable by kmalloc is
>128k. This limits the size of a reiserfs to just under 2TB on a
>64-bit platform (16384 bitmaps times 8bytes per pointer) or just under
>4TB on a 32 bit platform (32768 bitmaps times 4bytes per pointer).
>
>This reasoning assumes that the number of bitmaps is given by the
>formula (number_of_blocks + (8 * blocksize - 1))/(8 * blocksize) where
>blocksize is 4096 bytes. Thus
> number_of_blocks = 8 * 4096 * (16384 - 1) - 1 [64 bit]
>
> number_of_blocks = 8 * 4096 * (32768 - 1) - 1 [32 bit]
>
>Hacking mm/slab.c to increase the memory limit allowed larger
>filesystems to be mounted, but I haven't tested these thoroughly yet.
>--
>Dr Peter Chubb peterc@gelato.unsw.edu.au
>You are lost in a maze of BitKeeper repositories, all almost the same.
>
>
>
>
>
Thanks for figuring this out. Oleg will fix it.
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This archive was generated by hypermail 2b29 : Sun Jul 07 2002 - 22:00:15 EST