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authorChris Mason <chris.mason@oracle.com>2009-01-22 09:23:10 -0500
committerChris Mason <chris.mason@oracle.com>2009-01-22 09:23:10 -0500
commita717531942f488209dded30f6bc648167bcefa72 (patch)
treef4e0c852d4462574ade5e965585647e7a253abe3 /.gitignore
parent1506fcc8189cdd4b95e06df7845a09f18b4526a6 (diff)
downloadlinux-a717531942f488209dded30f6bc648167bcefa72.tar.bz2
Btrfs: do less aggressive btree readahead
Just before reading a leaf, btrfs scans the node for blocks that are close by and reads them too. It tries to build up a large window of IO looking for blocks that are within a max distance from the top and bottom of the IO window. This patch changes things to just look for blocks within 64k of the target block. It will trigger less IO and make for lower latencies on the read size. Signed-off-by: Chris Mason <chris.mason@oracle.com>
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