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From: Alexander Motin <mav@FreeBSD.org>
Date: Thu, 10 Dec 2009 23:51:24 +0000 (UTC)
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X-FreeBSD-CVS-Branch: RELENG_8
Subject: cvs commit: src/sbin/geom/class/mirror geom_mirror.c gmirror.8
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mav         2009-12-10 23:51:24 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_8)
    sbin/geom/class/mirror geom_mirror.c gmirror.8 
  Log:
  SVN rev 200373 on 2009-12-10 23:51:24Z by mav
  
  MFC r200282, r200290:
  Change gmirror default balance algorithm from "split" to improved "load".
  "split" is very ineffective for devices with rotating media as HDDs.
  To be effective, it needs that transfer time reduction due to block
  splitting was bigger then access time increase due to non-sequential
  access. For modern HDDs I was able to reproduce it only with read sizes
  of 2MB and above, which is almost not applicable in real life.
  "load" algorithm same time is more universal and effective now.
  
  Revision   Changes    Path
  1.17.10.3  +1 -1      src/sbin/geom/class/mirror/geom_mirror.c
  1.23.10.4  +2 -2      src/sbin/geom/class/mirror/gmirror.8