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Message-Id: <19970730205524.12427@mi.uni-koeln.de>
Date: Wed, 30 Jul 1997 20:55:24 +0200
From: Stefan Esser <se@FreeBSD.ORG>
To: Jason Young <doogie@forbidden-donut.anet-stl.com>
Cc: john hood <cgull@smoke.marlboro.vt.us>,
        =?iso-8859-1?Q?S=F8ren_Schmidt?= <sos@sos.freebsd.dk>,
        freebsd-current@FreeBSD.ORG
Subject: Re: code talks:  announcing EIDE bus master patches
References: <199707301049.GAA03660@smoke.marlboro.vt.us> <Pine.BSF.3.96.970730130024.28527E-100000@forbidden-donut.anet-stl.com>
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In-Reply-To: <Pine.BSF.3.96.970730130024.28527E-100000@forbidden-donut.anet-stl.com>; from Jason Young on Wed, Jul 30, 1997 at 01:01:39PM +0000
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On Jul 30, Jason Young <doogie@forbidden-donut.anet-stl.com> wrote:
> > you have a 486-class machine that doesn't have busmastering IDE.  it's
> > not even a PCI bus machine.  you just happened to turn on the
> > already-existing multi-block and 32-bit PIO flags in your latest
> > kernel upgrade.
> > 
> > folks: performance with the default flags on the wd driver is
> > *terrible*, and the flags should always be configured for your
> > machine.  see LINT for details.
> 
> Yes it's 486-class, but it has a PCI bus. Otherwise I wouldn't have
> bothered with the code.

I don't think there is bus-master EIDE support in any 486 class
PCI chip set. And besides, you also need a hard disk that knows
about DMA modes. Most dind't until recently ...

Regards, STefan