750e1f88d3
It is helpful to tune zfs_per_txg_dirty_frees_percent for commit 539d33c7(OpenZFS 6569 - large file delete can starve out write ops). Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed by: Richard Elling <Richard.Elling@RichardElling.com> Signed-off-by: Feng Sun <loyou85@gmail.com> Closes #7718