On Mon, Nov 23, 2009 at 08:44:10AM +1100, matthew green wrote: > > Module Name: src > Committed By: bouyer > Date: Sun Nov 22 21:41:03 UTC 2009 > > Modified Files: > src/sys/arch/amd64/include: vmparam.h > src/sys/arch/x86/x86: x86_machdep.c > > Log Message: > For amd64, introduce a third free list distinct from the default free list > for memory between 16M and 4G. On large memory machine, this avoids > the 32bit-accessible memory being eaten by various kernel early allocation, > causing 32bit bus_dma(9) memory allocation to fail at boot time. > Tested on a system with 48GB RAM; based on netbsd-5 patch proposed on > port-amd64 3 days ago. > > > i wonder if we should do this on i386 PAE as well?
We'll probably have to do it for i386 PAE when it's natively supported (just define a VM_FREELIST_FIRST4G in i386/vmparam.h for this case). it's not needed for Xen because the management of free lists like this is managed by the hypervisor. -- Manuel Bouyer <bou...@antioche.eu.org> NetBSD: 26 ans d'experience feront toujours la difference --