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SubjectRe: fork: out of memory
On Thu, 27 Nov 1997, Rik van Riel wrote:

> 128 k would be enough, the largest DMA buffer allocated by devices
> is 64k in size (soundcard) and ftape uses 3 32k area's. the scsi
> tape driver also uses quite some space, but also multiple 32k
> regions. floppy driver needs a small piece of dma memory (xxk?)
> and some network/scsi cards do.

I remain unconvinced that solving the problem for a limited
range of known hardware on an ISA bus is a good solution for
an OS that runs on many different system architectures for
which new hardware is being constantly developed by third parties.

I'm not convinced it is even a good solution for an ISA bus.
If you have something like an Adaptec 154x you don't really
want all your I/O going through bounce buffers. A good solution
would bias allocations to suitable memory where possible and
would be able to satisfy explicit requests for certain flavours
of pages.

Mike

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| Mike Jagdis | Internet: mailto:mike@roan.co.uk |
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