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Re: CVS commit: src/sys/arch
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
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