- 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: Douglas Gilbert <dgilbert@interlog.com> Reviewed-by: Robert Elliott <elliott@hp.com> Tested-by: Robert Elliott <elliott@hp.com> Signed-off-by: Christoph Hellwig <hch@lst.de>