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Date: Fri, 4 May 2007 16:51:05 +1000 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: Scott Long <scottl@samsco.org>
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Cc: stable@freebsd.org, "Sean C. Farley" <sean-freebsd@farley.org>,
	Ulrich Spoerlein <uspoerlein@gmail.com>
Subject: Re: acd and iostat [was Re: FreeBSD vs Region Code DVDs]
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On Fri, 4 May 2007, Scott Long wrote:
 > Ian Smith wrote:
 > > On Thu, 3 May 2007, Scott Long wrote:
 > > 
 > >  > Ulrich Spoerlein wrote:
 > > [..]
 > >  > > PS: why is iostat(1) not working for acd(4) devices?
 > >  > 
 > >  > Because acd doesn't make use of the standard kernel facilities that make
 > >  > iostat work.  It's a deliberate choice by the driver author.
 > > 
 > > Same for systat -vm of course.  I guess this was a regression, as acdX
 > > used to show up fine in 4.X in {sys,io}stat, whether or not also showing
 > > cdX (with atapicam).  I often used to watch it while testing burned CDs. 
 > > 
 > > Was that because of an API change to said kernel facilities, perhaps?
 > > 
 > > Cheers, Ian
 > > 
 > 
 > No, the devstat kernel API hasn't changed in since it was introduced 
 > nearly 10 years ago.

Thanks.  The only other reason I can see for removing acdX from these
stats would be to save on some admittedly precious screen real estate.

Cheers, Ian