Re: DMA transfers in 2.5.67

Alan Cox (alan@lxorguk.ukuu.org.uk)
15 Apr 2003 21:31:25 +0100

On Maw, 2003-04-15 at 21:01, Måns Rullgård wrote:
> What do I need to do in a driver before doing DMA transfers to a PCI
> card? Using a driver that worked in 2.4 gives a throughput of only 10
> MB/s in 2.5.67. Is there some magic initialization that I have
> missed?

Assuming your driver uses the new PCI api for DMA in 2.4/2.5 then there
isnt really anything to watch. Is this on a box with > 800Mb of memory
however ?

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