i386 PAE support (64g physmem)

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#1 (permalink)

02-18-2008, 08:16 AM

mickey

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i386 PAE support (64g physmem)

re
here is the diff that does it.
make sure option I686_PAE is in your generic.
there is a little testing trick that limits
the <4g memory to only 512m thus forcing more
of the higher memory usage.
(grep for ^if in machdep.c)

mfs has been known to have troubles currently.
also no apm or pcibios could be used.

current design tries to force all dmable memory
allocations from the 32bit memory thus avoiding
bounce buffering. normal page allocations are
otherwise preferred to be in the higher memory.
seems to work just fine on averagely loaded machine.
last resort is bouncy-bouncy of course...

the diff is in:
http://doorslam.net/pae.gz

please test and/or read. feedback is welcome.
10x
cu

--
paranoic mickey (my employers have changed but, the name has remained)

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i386 PAE support (64g physmem)