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From: "Kenneth D. Merry" <ken@FreeBSD.org>
Date: Fri, 17 Sep 2010 21:53:56 +0000 (UTC)
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Subject: cvs commit: src/sys/dev/mps mps.c mps_sas.c
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ken         2010-09-17 21:53:56 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/mps          mps.c mps_sas.c 
  Log:
  SVN rev 212802 on 2010-09-17 21:53:56Z by ken
  
  Fix a couple of mps problems.
  
  When the driver is completely saturated with commands (1024 in the
  case of the SAS2008 in my test system), I/O stops.  If we tell CAM
  that we have one less command slot than we have actually allocated,
  everything works fine.  We also need a few extra command slots to
  allow for aborts and other task management commands to be sent down.
  
  This needs more investigation to determine the root cause, but for
  now this fixes things in my testing.
  
  mps.c:          Change a printf() to mps_printf().
  
  mps_sas.c:      Subtract 5 command slots when we tell CAM how many
                  commands we can handle.
  
                  Add some commented-out logic to print the contents
                  the CDBs for timed-out commands.  This can help
                  in debugging devices that are timing out.  This
                  will be uncommented once I bring some CAM changes in.
  
  Reported by:    Andrew Boyer <aboyer at averesystems dot com>
  
  Revision  Changes    Path
  1.2       +1 -1      src/sys/dev/mps/mps.c
  1.4       +38 -3     src/sys/dev/mps/mps_sas.c