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hash: reduce hash table extent size to 128KB

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The 16MB hash table extent size did not serve any useful defragmentation
or compression purpose, and for very small filesystems (under 100GB),
16MB is much larger than necessary.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2018-10-08 23:31:16 -04:00
parent c01f129eee
commit 924008603e
3 changed files with 4 additions and 4 deletions
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docs/how-it-works.md
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@ -16,7 +16,7 @@ be stored on a different btrfs filesystem, ext4, or even CIFS.
bees uses a persistent dedupe hash table with a fixed size configured
by the user. Any size of hash table can be dedicated to dedupe. If a
fast dedupe with low hit rate is desired, bees can use a hash table as
small as 16MB.
small as 128KB.
The bees hash table is loaded into RAM at startup and `mlock`ed so it
will not be swapped out by the kernel (if swap is permitted, performance