Messages in this thread | | | Date | Wed, 7 Oct 1998 13:36:29 -0400 | From | "Theodore Y. Ts'o" <> | Subject | Re: [OT] RE: UDI and Free Software |
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From: alan@lxorguk.ukuu.org.uk (Alan Cox) Date: Wed, 7 Oct 1998 12:50:28 +0100 (BST)
> to native drivers... For some hardware it may not make a difference > (for example, a scanner). But for other hardware (such as a gigabit > ethernet board), my guess is that UDI will be a disaster as far as > performance is concerned.
UDI has no concept of other interface libraries or access API's - so it lacks stuff like check_region that is central to the Linux philosophy. UDI on Linux would also be useless for parallel scanners - UDI can't describe talking to the parport management layer
Exactly. So you'd have to do an extra memory copy in the Linux<->UDI interface layer. It'll be slow, but you an make it work. See my previous comments about UDI always being a poor second cousin to real native drivers.....
- Ted
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