[src/trunk]: src/sys/dev/ata do not use the NCQ priority by default; seems it...

[jdolecek <jdolecek%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/5ae82ae9c0cc
branches:  trunk
changeset: 827105:5ae82ae9c0cc
user:      jdolecek <jdolecek%NetBSD.org@localhost>
date:      Sat Oct 14 13:20:32 2017 +0000

description:
do not use the NCQ priority by default; seems it negatively affects
performance at least with some drives, so this needs better understood first

diffstat:

 sys/dev/ata/wd.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r 097a58848856 -r 5ae82ae9c0cc sys/dev/ata/wd.c
--- a/sys/dev/ata/wd.c  Sat Oct 14 13:15:14 2017 +0000
+++ b/sys/dev/ata/wd.c  Sat Oct 14 13:20:32 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: wd.c,v 1.431 2017/10/14 13:15:14 jdolecek Exp $ */
+/*     $NetBSD: wd.c,v 1.432 2017/10/14 13:20:32 jdolecek Exp $ */
 
 /*
  * Copyright (c) 1998, 2001 Manuel Bouyer.  All rights reserved.
@@ -54,7 +54,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: wd.c,v 1.431 2017/10/14 13:15:14 jdolecek Exp $");
+__KERNEL_RCSID(0, "$NetBSD: wd.c,v 1.432 2017/10/14 13:20:32 jdolecek Exp $");
 
 #include "opt_ata.h"
 #include "opt_wd.h"
@@ -2362,7 +2362,7 @@
                return;
        }
 
-       wd->drv_ncq_prio = true;
+       wd->drv_ncq_prio = false;
        if ((error = sysctl_createv(&wd->nodelog, 0, NULL, NULL,
                                CTLFLAG_READWRITE, CTLTYPE_BOOL, "use_ncq_prio",
                                SYSCTL_DESCR("use NCQ PRIORITY if supported"),