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From: Alexander Motin <mav@FreeBSD.org>
Date: Tue, 8 Dec 2009 23:23:45 +0000 (UTC)
To: cvs-src-old@freebsd.org
X-FreeBSD-CVS-Branch: RELENG_8
Subject: cvs commit: src/sys/geom/mirror g_mirror.c g_mirror.h
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mav         2009-12-08 23:23:45 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_8)
    sys/geom/mirror      g_mirror.c g_mirror.h 
  Log:
  SVN rev 200285 on 2009-12-08 23:23:45Z by mav
  
  MFC r200086:
  Change 'load' balancing mode algorithm:
  - Instead of measuring last request execution time for each drive and
  choosing one with smallest time, use averaged number of requests, running
  on each drive. This information is more accurate and timely. It allows to
  distribute load between drives in more even and predictable way.
  - For each drive track offset of the last submitted request. If new request
  offset matches previous one or close for some drive, prefer that drive.
  It allows to significantly speedup simultaneous sequential reads.
  
  PR:             kern/113885
  
  Revision   Changes    Path
  1.96.2.2   +24 -28    src/sys/geom/mirror/g_mirror.c
  1.24.10.2  +2 -2      src/sys/geom/mirror/g_mirror.h