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A comment on Why Virtual Machines suck when you run them from BTRFS files system. Parent comment

Re:Why Virtual Machines suck when you run them from BTRFS fi... by aliguori on Thursday July 14, 2011 @06:50PM (#2765513)
A lot of filesystems don't optimize O_SYNC heavily until it becomes necessary. ext4 has really bad O_SYNC performance until pretty recently FWIW.

Given where BTRFS is right now development wise, it's not at all surprising O_SYNC hasn't been optimized yet.

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