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Subject: Re: IDE UDMA/ATA Suckage, or something else?
To: pgallen@randomlogic.com (Paul G. Allen)
Date: Mon, 13 Aug 2001 14:20:34 +0100 (BST)
Cc: linux-kernel@vger.kernel.org (Linux kernel developer's mailing list),
        kplug-list@kernel-panic.org (kplug-list@kernel-panic.org)
In-Reply-To: <no.id> from "Paul G. Allen" at Aug 12, 2001 05:30:30 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> Currently, I am running a 2.4.7-ac10 SMP debug kernel on my K7 Thunder
> and I was hoping things would be better, and if not then at least I
> could see something in the logs if it did crash/lock. I also compiled
> NVidia driver with debugging enabled. Things are no better as the system
> still locks up frequently while playing Quake 3, and I can't even start
> Unreal Tournament without it locking and requiring a reset (SysRq,
> logging in remotely, etc. does not work). The logs tell me nothing.

Once you've touched the 3D stuff I dont actually care about bug reports that
boot even after 3d unloaded. I'm simply sick of fielding Nvidia's bug
reports.

> What I have found is that if I disable DMA on my IBM ATA100 drive, the
> system is quite stable (though it is slow as snot - running at a
> ridiculous 4.5MB/sec. as compared to 35MB/sec. with UDMA33/66 enabled).

You must disable IDE prefetch on the current versions of the AMD MP 
chipset, you may also need to enable "noapic".