Re: CONFIG_BIGMEM and rawio
Alan Cox (alan@lxorguk.ukuu.org.uk)
Fri, 3 Sep 1999 10:52:05 +0100 (BST)
> But OTHO, if you buy 4 GB memory you want good performance. If you use
> raw-io, then you need good IO performance, so you would buy a
> DMA-controller.
>
> Basically, I'm sure that 99.9% of the bounce buffer cases would be on
> developer machines, noone would use such an installation for production.
>
> I think it would be acceptable to say "if you want > 2 GB memory and
> raw-io, then you must buy a DMA controller."
Unfortunately if rawio causes random spontaneous peculiar fails on 4Gig
systems nobody will use rawio. There is a certain amount of 'consistency
matters' involved here.
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