1. 01 Aug, 2014 1 commit
  2. 30 Jul, 2014 5 commits
  3. 29 Jul, 2014 8 commits
  4. 26 Jul, 2014 1 commit
    • Douglas Gilbert's avatar
      scsi_debug: support scsi-mq, queues and locks · cbf67842
      Douglas Gilbert authored
       - add host_lock option whose default value is 0 which removes the
         host_lock around all queued commands
       - accept delay=-1 (_hi_) or -2 which use a tasklet to invoke
         the scsi_done callback into the mid-layer. The default
         is still delay=1 which uses a timer to delay 1 jiffy
       - wire .change_queue_depth and .change_queue_type
         functions to better simulate queueing in a modern LLD
       - add SCSI_DEBUG_OPT_Q_NOISE (0x200) mask to only produce
         debug output associated with queue full, plus from
         .change_queue_depth and .change_queue_type functions
       - add SCSI_DEBUG_OPT_ALL_TSF (0x400) mask which reports
         all queued_arr fulls at TASK_SET_FULL, otherwise
         SCSI_MLQUEUE_HOST_BUSY is returned
       - add SCSI_DEBUG_OPT_RARE_TSF (0x800) mask which works
         together with the every_nth option (> 0) to count
         occurrences of num_in_q==queue_depth. When every_nth
         is reached the victim (a command) yields TASK SET FULL
       - clean up many debug messages.
       - add ndelay=<nanosecs> option that uses high resolution
         timers; active if > 0 and then overrides delay= option
       - expand Unit Attention handling: POR, BUS_RESET and
         MODE PARAMETERS CHANGED
       - support .eh_target_reset_handler and drop .bios_param
       - add OPT_N_WCE mask so caching page yields WCE=0
       - add OPT_RESET_NOISE mask to log aborts and resets
       - add OPT_NO_CDB_NOISE mask to not log each cdb
       - MODE SELECT support for changing caching page's WCE
       - name common ioctls in log
       - when fake_rw=1, do not vmalloc fake store; make
         UNMAP and WRITE SAME obey fake_rw
       - more logging and code improvements including better
         sense buffer handling
      
      With fio and four (pseudo) devices I have observed 1.2 M IOPS
      on my equipment. Rob Elliott who has done much testing and made
      numerous suggestions, has better IOPS results than mine.
      Signed-off-by: default avatarDouglas Gilbert <dgilbert@interlog.com>
      Reviewed-by: default avatarRobert Elliott <elliott@hp.com>
      Tested-by: default avatarRobert Elliott <elliott@hp.com>
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      cbf67842
  5. 25 Jul, 2014 25 commits