Re: bus_dmamap_sync() for uhci(4)

[Michael Lorenz <macallan%NetBSD.org@localhost>]

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Hello,

On Jun 22, 2008, at 15:08, Izumi Tsutsui wrote:
> bouyer%antioche.eu.org@localhost wrote:
>
> > No, but data xfers are also done though bus_dmamem_alloc()'ed memory.
> > The USB subsystem does memcpy() from/to this memory for each  
> > transfers.
>
> Okay, I see.
> I didn't think all data DMA xfers are also done via memcpy() :-/

It explains the high CPU load during USB transfers I see on my O2 :/

have fun
Michael
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