Messages in this thread | | | From | (Alan Cox) | Subject | Re: Sound problems, Scsi CDDA ripping. 2.2+ | Date | Sun, 21 Feb 1999 16:12:41 +0000 (GMT) |
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> > Probably the 'reserve Xmb below 16mb for dma memory' is the best solution. > > eg in lilo.conf something like > > append = "dmaram=2m" > > > Exactly my point... > Now who wants to implement this? as I know nothing about Linux's MM ;)
Reserving low memory space is fairly easy. You'd probably want a different function to kmalloc managing it (kmalloc is called an awful lot), and your dma memory allocator could call kmalloc itself as a last resort.
> (of course the other solution would be modifying the MM to do some more > aggressive try_to_get_dmable_memory type thingies)
That may work. Someone was playing with it
> And this raises a question about Linux's MM: How hard is it for the kernel > to relocate things in physical memory?
Its definitely not 2.2 stuff, its a generally hard problem.
Alan
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