> Is there any remaining reason today for dmaon not being the default?

I don't think so, but I have this following patch still pending:

http://plan9.bell-labs.com/sources/patch/maybe/sdata-dma/

Erik also provides a way to enable DMA in plan9.ini,
as part of 9atom.

Personally, I ended up with this more drastic approach::

http://www.9legacy.org/9legacy/patch/pc-sdata-dma-lite.diff

It always enable DMA by default.

-- 
David du Colombier

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