Re: 2.1.111: IDE DMA disabled?

Alan Cox (
Sun, 26 Jul 1998 21:02:06 +0100 (BST)

> I have a very clear report of a person who could reproduce the behaviour
> at will.

One person isnt statistically valid for fixing 'the bug' v 'his bug'

> And yes, he couldn't reproduce it at will without SMP. Which may mean that
> there is a SMP problem, but is equally likely to mean that with SMP
> enabled the machine had enough memory load that the DMA problems started
> occurring because the timings were so tight.

Which is a hardware bug. Ok so we do need to consider it. Was it a WD drive
by any chance ?

> In short, you should not force users to have cutting-edge hardware. You
> should not live at the edge of the spec software-wise, because you know
> there is hardware out there that is sub-spec. A good driver takes sub-spec
> hardware into account, whereas a bad drivers says "your hardware is
> sub-spec, so screw you".

What Im questioning is whether you are fixing a single persons dodgy machine,
a real problem in the IDE layer, or a real hardware problem.

When I've got a pile more bug reports I'll try and answer that. Until then
its speculation on all sides.


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