Date: Sun, 22 Nov 1998 02:50:53 -0600 From: Zach Heilig <zach@gaffaneys.com> To: Chan Yiu Wah <c5666305@b1.hkstar.com>, freebsd-current@FreeBSD.ORG Subject: Re: how to solve open tagging...64 Message-ID: <19981122025053.A830@znh.org> In-Reply-To: <199811220644.OAA14251@b1.hkstar.com>; from Chan Yiu Wah on Sun, Nov 22, 1998 at 02:44:55PM %2B0800 References: <199811220644.OAA14251@b1.hkstar.com>
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On Sun, Nov 22, 1998 at 02:44:55PM +0800, Chan Yiu Wah wrote:
> Hello,
>
> I recenlty upgrade my system upto src-cur.3627.gz and found that the
> system report open tagging ... 64. Is it harmful to the system and how
> to solve it. I do think it had been talking about but I missed it (sorry).
You mean a message like this:?
(da1:ahc0:0:1:0): tagged openings now 15
[ It's an older quantum disk ]
It merely states the number of tagged commands the drive supports. It is one
indicator of how good the drive is. 64 is good, 15 (like my disk) is pretty
bad. What are tagged commands good for? They allow the operating system to
send multiple commands to the device, and let the device send back results as
the commands complete (in any order).
The only time you might need to be concerned is if you see something like:
(da1:ahc0:0:1:0): tagged openings now 64
(da1:ahc0:0:1:0): tagged openings now 63
(da1:ahc0:0:1:0): tagged openings now 62
(da1:ahc0:0:1:0): tagged openings now 61
(da1:ahc0:0:1:0): tagged openings now 60
(da1:ahc0:0:1:0): tagged openings now 59
(da1:ahc0:0:1:0): tagged openings now 58
(da1:ahc0:0:1:0): tagged openings now 57
(da1:ahc0:0:1:0): tagged openings now 56
(da1:ahc0:0:1:0): tagged openings now 55
(da1:ahc0:0:1:0): tagged openings now 54
(da1:ahc0:0:1:0): tagged openings now 53
(da1:ahc0:0:1:0): tagged openings now 52
...
(da1:ahc0:0:1:0): tagged openings now 0
Perhaps this patch to cam_xpt.c might be in order: :-)
Index: cam_xpt.c
===================================================================
RCS file: /home/ncvs/src/sys/cam/cam_xpt.c,v
retrieving revision 1.26
diff -u -r1.26 cam_xpt.c
--- cam_xpt.c 1998/11/04 19:56:24 1.26
+++ cam_xpt.c 1998/11/22 08:41:17
@@ -2939,7 +2939,8 @@
if (bootverbose || 1) {
xpt_print_path(crs->ccb_h.path);
printf("tagged openings "
- "now %d\n",
+ "now %d [ignorable "
+ "message]\n",
crs->openings);
}
}
--
Zach Heilig (zach@gaffaneys.com)
Woah! Put me down as absolutely against this position. Put my face on
your dart board, if you must! (Stephen McKay)
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