Messages in this thread | | | Date | Sun, 21 Feb 1999 10:11:43 +0200 (EET) | From | Tuomas Heino <> | Subject | Re: Sound problems, Scsi CDDA ripping. 2.2+ |
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On Sat, 20 Feb 1999, Dan Hollis wrote:
> On Sat, 20 Feb 1999, Alan Cox wrote: > > > I think we need some way to reserve DMA:ble memory in some early stage of > > > booting up the 'puter... or then the memory allocation crap should be > > > redone once again from scratch ;) > > Then you might as well load the stuff at boot time. This is an issue that > > eventually has to get sorted. Im now sitting on yet another sound card that > > wants 1->4Mb of memory in 256K blocks. > > The problem is that many drivers allocate memory on the fly, not just > allocate at load and hold it. So even sound drivers that are compiled into > the kernel can fail when trying to grab dma memory. So all drivers would > have to change to grabbing and holding ram rather than dynamic. > > 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 ;) (of course the other solution would be modifying the MM to do some more aggressive try_to_get_dmable_memory type thingies) And this raises a question about Linux's MM: How hard is it for the kernel to relocate things in physical memory?
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