From owner-freebsd-current  Wed Mar  3 13:13:29 1999
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From: Mikhail Teterin <mi@misha.cisco.com>
Message-Id: <199903032112.QAA19717@misha.cisco.com>
Subject: Re: aic0 and CAM
In-Reply-To: <Pine.LNX.3.96.990303125000.10312A-100000@shell2.aracnet.com> from Brian Beattie at "Mar 3, 1999 12:58:13 pm"
To: current@freebsd.org
Date: Wed, 3 Mar 1999 16:12:27 -0500 (EST)
Reply-To: mi@aldan.algebra.com
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> > It has pretty horrible performance problems on 2.2.8-STABLE, even when
> > using DMA:

> > [...]
> >  4.4%Sys  91.9%Intr  3.7%User  0.0%Nice  0.0%Idl 4244 inact 204 pci irq9
> > |    |    |    |    |    |    |    |    |    |   5288 cache 105 aic0 irq11
> > ==++++++++++++++++++++++++++++++++++++++++++++++  248 free  104 wdc0 irq14
> > [...]
 
> I would not use this type of card for disk if I could avoid it, and
> probably not for tape either, I have a scanner I plan to use with it.

Yes, tape is the only target on this bus here... From reading the 2.2.8's
driver's source I see the DMA is not "yet supported", although the card
supports it and lets me choose the drq. Still, the amount of CPU it takes
to process an interrupt (CyrixInstead 8x86 at over 200MHz) does not look
right....

	-mi


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