> 1. Is this 980M just a kludgy guess or is it some precisely determined magic
> number? I want to make sure because I don't know if other things besides
> the tape drive and floppy are flakey. I'd like the maximum number at which
> I can be guaranteed that everything will work.
Its a reasonable guess. Basically vmalloc needs address space, so we leave
44Mb for vmalloc use.
> 2. Why can't I use 1G, or at least 1G minus a very small amount. 980M means
> wasting 44M which is almost 5%.
User space - 3Gig + physical 980M + vmalloc 44M = 4Gig = 32bit address space
2.1.x will let you tweak it for a 2Gig user space per process
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