Manuel Bouyer wrote: > 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.
Is this also true when you assign more than 4GB RAM to the Dom0 ? Christoph
