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freebsd-nq/sys/cam
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Kenneth D. Merry ca3b51e9ed Disable tagged queueing for the IBM DCAS drives. These drives have poor 
write performance when tagged queueing is enabled.

Although the PR was submitted for the 4 gig version of this drive, the
assumption is that the 2 gig version has the same problem.  Therefore
tagged queueing is disabled for both.

Also, update the comment for the Western Digital Enterprise drives to note
that the best performance for those drives is achieved when tagged queueing
is disabled and write caching is enabled.

PR:		kern/10398
Submitted by:	Hideaki Okada <hokada@isl.melco.co.jp>
1999-03-14 05:15:38 +00:00
..
scsi Implement the control device for the "targ" target mode processor target 1999-03-05 23:25:11 +00:00
cam_ccb.h Add constants and macros for dealing with XPT opcode group types. 1999-03-05 23:13:20 +00:00
cam_conf.h CAM Transport Layer (XPT). 1998-09-15 06:33:23 +00:00
cam_debug.h Add a CAM_DEBUG_XPT define (to debug XPT layer only). Add a CAM_DEBUGGED 1998-12-05 23:55:48 +00:00
cam_extend.c CAM Transport Layer (XPT). 1998-09-15 06:33:23 +00:00
cam_extend.h CAM Transport Layer (XPT). 1998-09-15 06:33:23 +00:00
cam_periph.c This is a rather large commit that encompasses the new swapper, 1999-01-21 08:29:12 +00:00
cam_periph.h Fix a problem with the way we handled device invalidation when attaching 1998-10-22 22:16:56 +00:00
cam_queue.c CAM Transport Layer (XPT). 1998-09-15 06:33:23 +00:00
cam_queue.h Add definitions for TAILQ, LIST, and SLIST ccb_hdr queues. 1998-12-15 08:12:03 +00:00
cam_sim.c CAM Transport Layer (XPT). 1998-09-15 06:33:23 +00:00
cam_sim.h CAM Transport Layer (XPT). 1998-09-15 06:33:23 +00:00
cam_xpt_periph.h CAM Transport Layer (XPT). 1998-09-15 06:33:23 +00:00
cam_xpt_sim.h xpt_done has no reason to take a volatile ccb *. 1999-03-05 23:18:56 +00:00
cam_xpt.c Disable tagged queueing for the IBM DCAS drives. These drives have poor 1999-03-14 05:15:38 +00:00
cam_xpt.h CAM Transport Layer (XPT). 1998-09-15 06:33:23 +00:00
cam.c cam.c: 1998-09-22 04:53:23 +00:00
cam.h CAM Transport Layer (XPT). 1998-09-15 06:33:23 +00:00