Date: Wed, 16 Sep 2015 18:09:45 -0700 From: Matthew Ahrens <mahrens@delphix.com> To: freebsd-fs <freebsd-fs@freebsd.org> Subject: changing space map blksz, commit from illumos Message-ID: <CAJjvXiGKBY_45Kk%2BwBC6wwkw0zprbLRReHQS8rYSwsAc8h6%2BSA@mail.gmail.com>
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I would like to change the space map block size on FreeBSD, to improve
performance on a system with very large vdevs. This was made possible in
illumos (exactly!) a year ago by the commit below. Does anyone know if
there's a technical reason that this was not ported to FreeBSD? If not, it
would be great if someone wants to pick it up, otherwise I'll try to do so
when I have time.
commit b1be2892dd07cf9a97d47ad06334cdc879196aaf
Author: Matthew Ahrens <mahrens@delphix.com>
Date: Tue Sep 16 11:53:58 2014 -0800
5164 space_map_max_blksz causes panic, does not work
5165 zdb fails assertion when run on pool with recently-enabled
spacemap_histogram feature
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Saso Kiselkov <skiselkov.ml@gmail.com>
Approved by: Dan McDonald <danmcd@omniti.com>
--matt
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