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    SubjectRe: [PATCH] snd-hda-intel: fix insufficient memory
    On Wed, 22 Nov 2006 18:19:49 +0100
    wbrana@gmail.com wrote:

    > Module uses shorter buffer if memory isn't sufficient.
    > It doesn't change size of allocated memory automatically.
    > User has to change it with command like this:
    > echo 256 > /proc/asound/card0/pcm0p/sub0/prealloc
    > I can change it, but many regular users don't know it.
    > This card is used in new PCs, which have at least 256 MB RAM.
    > 256 kB shouldn't be too much. Whole block isn't used if it isn't needed.

    That didn't answer my question.

    > On 11/22/06, Andrew Morton <akpm@osdl.org> wrote:
    > > On Tue, 21 Nov 2006 21:33:29 +0100
    > > wbrana@gmail.com wrote:
    > >
    > > > Module allocates insufficient memory for multichannel and high quality
    > > > audio (96 kHz, 24 bit)
    > > > Patch for 2.6.19-* changes default/maximal size from 64/128 to 256/4096 kB.
    > > >
    > > > --- sound/pci/hda/hda_intel.c.orig 2006-09-29 13:40:36.000000000 +0200
    > > > +++ sound/pci/hda/hda_intel.c 2006-11-05 16:45:13.000000000 +0100
    > > > @@ -1270,5 +1270,5 @@
    > > > snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
    > > > snd_dma_pci_data(chip->pci),
    > > > - 1024 * 64, 1024 * 128);
    > > > + 1024 * 256, 1024 * 4096);
    > > > chip->pcm[pcm_dev] = pcm;
    > > > if (chip->pcm_devs < pcm_dev + 1)
    > >
    > > This was recently increased, but not by such a large amount:
    > >
    > > snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
    > > snd_dma_pci_data(chip->pci),
    > > 1024 * 64, 1024 * 1024);
    > >
    > > is that sufficient?
    > >

    Are the new settings of 64kb and 1MB sufficient? If not, by how much must
    they be increased, and why?

    -
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