From owner-freebsd-scsi  Wed Nov  1 14:46: 8 2000
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Date: Wed, 1 Nov 2000 18:43:55 -0400 (AST)
From: The Hermit Hacker <scrappy@hub.org>
To: "Justin T. Gibbs" <gibbs@scsiguy.com>
Cc: Tom Samplonius <tom@sdf.com>, freebsd-scsi@FreeBSD.ORG
Subject: Re: iostat: tps for SCSI drives ... 
In-Reply-To: <200011010510.eA15Aja05833@aslan.scsiguy.com>
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On Tue, 31 Oct 2000, Justin T. Gibbs wrote:

> >
> >On Tue, 31 Oct 2000, The Hermit Hacker wrote:
> >
> >> Okay, how do I read this:
> >> 
> >> pgsql# camcontrol tags da0 -v
> >> (pass0:ahc0:0:0:0): dev_openings  41
> >> (pass0:ahc0:0:0:0): dev_active    0
> >> (pass0:ahc0:0:0:0): devq_openings 41
> >> (pass0:ahc0:0:0:0): devq_queued   0
> >> (pass0:ahc0:0:0:0): held          0
> >> (pass0:ahc0:0:0:0): mintags       2
> >> (pass0:ahc0:0:0:0): maxtags       255
> >
> >  I wonder why dev_openings is lower than maxtags?  
> 
> Maxtags is the limit imposed by the quirk entry matching the device.

Okay, under what conditions would dev_openings == maxtags?  My best drive
that I can find on my various machines is a brand new LVD drive:

da0 at ahc0 bus 0 target 0 lun 0
da0: <QUANTUM ATLAS_V__9_WLS 0230> Fixed Direct Access SCSI-3 device 
da0: 160.000MB/s transfers (80.000MHz, offset 63, 16bit), Tagged Queueing Enabled
da0: 8755MB (17930694 512 byte sectors: 255H 63S/T 1116C)
mailserv# camcontrol tags da0 -v
(pass0:ahc0:0:0:0): dev_openings  64
(pass0:ahc0:0:0:0): dev_active    0
(pass0:ahc0:0:0:0): devq_openings 64
(pass0:ahc0:0:0:0): devq_queued   0
(pass0:ahc0:0:0:0): held          0
(pass0:ahc0:0:0:0): mintags       2
(pass0:ahc0:0:0:0): maxtags       255




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