Date: Tue, 29 Jul 1997 10:42:05 +0200 (MEST) From: Søren Schmidt <sos@sos.freebsd.dk> To: cgull@smoke.marlboro.vt.us (john hood) Cc: freebsd-current@FreeBSD.ORG Subject: Re: code talks: announcing EIDE bus master patches Message-ID: <199707290842.KAA00348@sos.freebsd.dk> In-Reply-To: <199707290424.AAA23424@smoke.marlboro.vt.us> from john hood at "Jul 29, 97 00:24:09 am"
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In reply to john hood who wrote:
> Søren Schmidt writes:
> > Well, I have two 4G EIDE Maxtors on my P6 :), when I get the bus master
> > DMA going, it'll be a tough bunch to beat...
>
> It's going to go a little quicker :)
>
> I've been coding up bus-mastering support for EIDE drives, and I'm at
> a point where I can release it to the world. I've got a patch against
> 2.2.2 available and various notes for the enjoyment of the curious
> kernel hacker. The wd driver is enough of a living fossil that the
> patches should apply easily to any kernel since then, though.
>
> The code is designed to support the SFF-8038 standard for busmaster
> controllers. It's generic enough to run on anything that nominally
> conforms to this (which includes every current PCI chipset I've seen);
> here's to hoping chipset quirks don't wreck this sublime quest.
>
> It's all very alpha yet, and it has been tested on exactly one system.
> but if the surreal thrill of watching a system transfer 6MB/s off an
> IDE disk with almost no cpu load mingled with the slight fear that
> it's trashing your disk at 6MB/s appeals to you, go to:
Well, doing a little surgery to it and sticking it into current,
(the PCI subsystem has changed a little from 2.2.x to current)
I'd say it works pretty well here too (440FX chipset Maxtor drives).
I'l beat on it for a while, then commit the changes to -current.
I think we should leave 2.2-STABLE out for the moment :)
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Søren Schmidt (sos@FreeBSD.org) FreeBSD Core Team
Even more code to hack -- will it ever end
..
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