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Subject: [Bug 222377] ZFS ABD wasteful...
Date: Sat, 16 Sep 2017 23:20:42 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D222377

            Bug ID: 222377
           Summary: ZFS ABD wasteful...
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: sean@chittenden.org

Created attachment 186440
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D186440&action=
=3Dedit
ABD chunk size 1K

ABD was developed by Delphix and spent most of its life in testing with a v=
alue
of 1024.  Late in the review process over at OpenZFS the value was bumped t=
o 4K
under the auspices of "page-aligned memory allocations perform better,"[1]
which is frequently true, however under production workloads we have found =
this
to be very wasteful.  The original 1K value should be restored and pushed
upstream into OpenZFS.  This change has already been made in Joyent's branc=
h of
Illumos[2].

https://github.com/openzfs/openzfs/pull/326#issuecomment-291223116

https://github.com/joyent/illumos-joyent/commit/09443b7960ae0f0a3ddcf56d187=
9e006c2790316

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