Zygo Blaxell 72cc9c2b60 ExtentWalker: increase efficiency for typical btrfs extent sizes ...

Perf was blaming more than 50% of cycles on TREE_SEARCH_V2.  strace
showed 4 TREE_SEARCH_V2 calls for every pread in grow_backward().

Fix by increasing the extent fetch batch size so it is more likely
to include the desired items in the first fetch attempt.

This removes TREE_SEARCH_V2 from the top 10 list of cycle consumers.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>

2018-01-28 22:52:07 -05:00

..

crucible

ExtentWalker: increase efficiency for typical btrfs extent sizes

2018-01-28 22:52:07 -05:00