K 10
svn:author
V 7
delphij
K 8
svn:date
V 27
2014-12-13T01:39:24.401360Z
K 7
svn:log
V 531
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

MFC after:	2 weeks

END