Dag-Erling Smorgrav scribbled this message on Aug 4: > "Kelly Yancey" <kby...@alcnet.com> writes: > > [...] > > Which reminds me - has anyone thought of using DMA for zeroing pages, > to avoid cache invalidation? The idea is to keep a chunk of zeroes on > disk and DMA it into memory instead of clearing pages "manually". This > assumes your disk supports DMA, of course.
has anyone looked at using two dma channels tied together to do memory copies? I haven't studied the DMA specs, but from what I know of the dma on x86 machines is that you could tie two dma channels together one to feed the other, and this would allow you to copy memory w/o using the processor... w/ dma channels, we can just make a copy of the base zero page... -- John-Mark Gurney Voice: +1 541 684 8449 Cu Networking P.O. Box 5693, 97405 "The soul contains in itself the event that shall presently befall it. The event is only the actualizing of its thought." -- Ralph Waldo Emerson To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-hackers" in the body of the message
