Xin LI 82599d31fe MFV r268851:
When a sync task is waiting for a txg to complete, we should hurry it along
by increasing the number of outstanding async writes (i.e. make
vdev_queue_max_async_writes() return a larger number).

Illumos issue:
    4753 increase number of outstanding async writes when sync task is waiting

MFC after:	2 weeks
2014-07-18 22:34:01 +00:00
..
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