K 10
svn:author
V 3
avg
K 8
svn:date
V 27
2017-02-21T21:09:21.088336Z
K 7
svn:log
V 417
zfs: lower priority of zio_write_issue threads by four

The difference of one was insignificant because zio_write_issue threads
ended up on the same run queues as other zio threads.
See sys/priority.h and sys/runq.h for more details.

Add a comment describing FreeBSD priority considerations and restore
the illumos variant of the code for comparison.

Obtained from:	Panzura
MFC after:	2 weeks
Sponsored by:	Panzura

END