From owner-freebsd-current  Wed Mar  3 12:51:20 1999
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From: "Kenneth D. Merry" <ken@plutotech.com>
Message-Id: <199903032050.NAA86828@panzer.plutotech.com>
Subject: Re: aic0 and CAM
In-Reply-To: <199903031950.OAA19405@misha.cisco.com> from Mikhail Teterin at "Mar 3, 1999  2:50:31 pm"
To: mi@aldan.algebra.com
Date: Wed, 3 Mar 1999 13:50:38 -0700 (MST)
Cc: current@FreeBSD.ORG, nate@FreeBSD.ORG, gconnor@cisco.com
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Mikhail Teterin wrote...
> What's the chance the Adaptec-152x controller (aic0) will soon work
> with 3.1-STABLE?

I think the chances are very slim that it will work soon with 3.x or 4.x.
It may get done at some point, but I don't think anyone is actively working
on it at the moment.

> 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
> [...]
> 
> (which may, of course, be due to the poor design of the board) and
> we were wondering if upgrading to 3.1-STABLE will help us in the
> foreseeable future?

The 152x boards are programmed I/O only, I believe.  They don't do DMA.
So it won't matter if the driver is rewritten for CAM, you'll still get
lousy performance from the board.

If you need a supported ISA controller, the Adaptec 154x controllers are
supported, as are the Advansys ISA controllers.  Both support DMA, and should
give you much better performance.

Ken
-- 
Kenneth Merry
ken@plutotech.com


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