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/freebsd-10.3-release/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/
H A Ddsl_scan.cdiff 277576 Fri Jan 23 17:42:35 MST 2015 delphij MFC r275738: MFV r275546:

Reduce scrub activities when system there is enough dirty data, namely when
dirty data is more than zfs_vdev_async_write_active_min_dirty_percent (once
we start to increase the number of concurrent async writes).

While there also correct rounding error which would make scrub end up
pausing for (zfs_txg_timeout + 1) seconds instead of the desired
zfs_txg_timeout seconds.

Illumos issue:
5351 scrub goes for an extra second each txg
5352 scrub should pause when there is some dirty data

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