Messages in this thread | | | Subject | Re: mmap question (2.2.12) | Date | Sat, 30 Oct 1999 13:53:02 +0100 (BST) | From | Alan Cox <> |
| |
> I've read here previously that bttv.c is a good example of how to do > this. I'm assigning the mmapped memory to the tulip chips, which PCI > Bus Master's the actual frame data into it.
BTTV is probably overkill unless you are using very large buffers.
> I didn't see any obvious limitation on size in the source (or through > man mmap()), but I am planning on doing ~30Mb using this. Is that a > problem?
The simple way its generally about 64K. The bttv approach its basically infinite providing you can do scatter gather DMA or land your packets suitably (eg on 2K boundaries 2 per page)
Alan
- 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/
| |