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[Xen-ia64-devel] Re: [PATCH]: use of max_addr= & command line

from [Alex Williamson]

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To:	Tristan Gingold <Tristan.Gingold@xxxxxxxx>
Subject:	[Xen-ia64-devel] Re: [PATCH]: use of max_addr= & command line
From:	Alex Williamson <alex.williamson@xxxxxx>
Date:	Thu, 16 Mar 2006 13:24:30 -0700
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On Thu, 2006-03-16 at 13:24 +0100, Tristan Gingold wrote:
> Hi,
> 
> Use 'max_addr' option to limit the amount of physical memory.  The default
> is 4G (the same as the previous hard limit).  The hard-coded limit is removed.
> dom0_command_line now contains the cmdline for dom0 linux.
> saved_command_line now contains the cmdline for Xen (it is used in Xen).

   Applied.  Maybe we should up the default from 4GB.  The problem on
zx1 is that a 3GB chunk of memory is relocated very high in the address
space.  For certain ranges of memory (w/o virtual memmap), the page
table is larger than available contiguous memory.  If we just ignore
that high memory for now, there's only a 3GB hole (1-4GB).  A default of
64GB might be reasonable, just know that on zx1 you'll lose those 3GB
until we add in virtual memmap support.  Do any other boxes need this
4GB limit?  Thanks,

        Alex

-- 
Alex Williamson                             HP Linux & Open Source Lab

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