Richard let's make this a bit more concrete. I'm working on a driver
for the Matrox Meteor-II framegrabber, which includes a bunch of memory
onboard. 128 MB max IIRC. Making the capture data available to
userspace can be done using busmastering DMA to system memory, or
grabbing to the Meteor's memory. In the first case, the data is made
available to userspace via remap_page_range. In the latter case,
io_remap_page_range.
Are you saying that, on a normal PCI-based x86 workstation, grabbing to
the Meteor's onboard RAM, and allowing xawtv to access that memory
across the PCI bus, will be the faster case?
Regards,
Jeff
-- Jeff Garzik | Liberty is always dangerous, but Building 1024 | it is the safest thing we have. MandrakeSoft, Inc. | -- Harry Emerson Fosdick- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
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