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2017-11-09T18:22:42.635949Z
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MFV r325609: 7531 Assign correct flags to prefetched buffers

illumos/illumos-gate@272952165423c254ad7708f1b3fe2ff0a6ce408b
https://github.com/illumos/illumos-gate/commit/272952165423c254ad7708f1b3fe2ff0a6ce408b

https://www.illumos.org/issues/7531
  I found that some buffers that could be L2ARC eligible are not flagged
  such, leading to some performance impact.  As a test I ran the same IO
  workload 10 times in a raw.  It is a metadata only workload (files
  listing).  l2arc_noprefetch=0.

Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Prakash Surya <prakash.surya@delphix.com>
Approved by: Dan McDonald <danmcd@joyent.com>
Author: benrubson <ben.rubson@gmail.com>

MFC after:	8 days

END