Btrfs: Raise thresholds for metadata writeback

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Btrfs metadata writeback is fairly expensive.  Once a tree block is written
it must be cowed before it can be changed again.  The btree writepages
code has a threshold based on a count of dirty btree bytes which is
updated as IO is sent out.

This changes btree_writepages to skip the writeout if there are less
than 32MB of dirty bytes from the btrees, improving performance
across many workloads.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

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This commit is contained in:

Chris Mason 2008-09-24 14:51:30 -04:00

parent 4434c33c7f

commit 24ab9cd85c

1 changed files with 2 additions and 2 deletions

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fs/btrfs/disk-io.c

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