On Fri, 7 May 2010, Daniel Mack wrote: > > Or to be precise it could be done with coherent memory, but you'd risk > > transfering partially updated buffers, as you cannot know when DMA will > > be done and we don't guarantee that DMA will be done right as we transfer. > > If the memory is coherent, it should be possible. And if buffers are > only partially updated, the audio buffer scheduling is too tight. IOW, > the configured buffer size of audio clients in userspace is too small. Even with coherent memory, this dynamic updating of buffer contents isn't a good idea. There's no guarantee that coherent memory won't be implemented using a bounce buffer during URB submission. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
