Re: Using DMA for memcpy()

Jason Hecker <[email protected]>
Newsgroups gmane.os.netbsd.devel.performance
Message-ID <[email protected]>
> I very much doubt you would get any improvement, in fact it would
> be hard to not lose out badly.

I've been mulling over it a bit more since I posted the query, and you're 
right.  Cache coherency would be a big problem, as would scheduling the 
DMA or trying to implement some piecemeal sharing mechanism so no one 
process is waiting too long to use the controller.  Forget I asked.  ;)  

Better off just using the DMA controller as needed as some sort of 
background copier.

-- 
Cheers,
jASON
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