[Bug 222377] ZFS ABD wasteful...

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222377

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: avg
Date: Wed Sep 20 08:36:31 UTC 2017
New revision: 323797
URL: https://svnweb.freebsd.org/changeset/base/323797

Log:
  add vfs_zfs.abd_chunk_size tunable

  It is reported that the default value of 4KB results in a substantial
  memory use overhead (at least, on some configurations).  Using 1KB seems
  to reduce the overhead significantly.

  PR:           222377
  Reported by:  Sean Chittenden <sean at chittenden.org>
  MFC after:    1 week

Changes:
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c

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