Re: CVS commit: src/sys/arch

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

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 <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--