Messages in this thread |  | | | Subject | Re: PATCH: Raw device IO for 2.1.131 | | Date | Mon, 14 Dec 1998 11:07:57 -0800 | | From | Stephen Williams <> |
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alan@lxorguk.ukuu.org.uk said: > Similarly scanners really want to be working direct scatter gather to > big DMA buffers. Its fairly crazy to then go copying those to user > space.
Yes, Yes, Yes! Thank you.
120 Pages/Minute Grayscale at 300DPI is adversely affected by memory copies. (NT has similar problems.) However, I coerce Linux into providing the data to the user without copying by allocating gobs of memory as a buffer and making the application map that memory. -- Steve Williams "The woods are lovely, dark and deep. steve@icarus.com But I have promises to keep, steve@picturel.com and lines to code before I sleep, http://www.picturel.com And lines to code before I sleep."
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