>> I was thinking of allowing the USB Stack to directly write to user
>> pages using PCI. If PCI doesn't also honour the bits we need, could
>> it be done by hand as the write is finished?
Alan> Ok firstly why do you need to write directly to user space
It is to offer a posibility to waste less resources. If I've
got this USB disk drive and I order to write 100K, if I know where
they are at use space, I just have to write from user space directly
to the drive. This way there is no intermediate buffering ... well,
the disk drive was a bad example [disk cache]; let's change it for
Audio device.
Alan> - you would normally want to buffer messages up anyway surely,
The message-type transfer are no problem, they're better using
buffers, as they are small. I'm more concerned on _long_
transfers. Alas, it is not too difficult to do on the USB code [if I'm
not doing it wrong :)].
Cheers
Linux-USB! http://peloncho.fis.ucm.es/~inaky/USB.html -
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Inaky Perez Gonzalez -- PGP pubkey fingerprint -
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