Re: fork: out of memory

Mike Jagdis (
Thu, 27 Nov 1997 14:28:21 +0000 (GMT/BST)

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 Jagdis                  |  Internet:   |
|  Roan Technology Ltd.         |                                      |
|  54A Peach Street, Wokingham  |  Telephone:  +44 118 989 0403        |
|  RG40 1XG, ENGLAND            |  Fax:        +44 118 989 1195        |