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Re: [Xen-ia64-devel] [PATCH] change layout of p2m table from xenheap to

from [Alex Williamson]

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To:	Kouya SHIMURA <kouya@xxxxxxxxxxxxxx>
Subject:	Re: [Xen-ia64-devel] [PATCH] change layout of p2m table from xenheap to domheap
From:	Alex Williamson <alex.williamson@xxxxxx>
Date:	Wed, 14 Mar 2007 15:16:06 -0600
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On Mon, 2007-03-12 at 18:28 +0900, Kouya SHIMURA wrote:
> Hi,
> 
> Current xen can not fully utilize 64GB memory since xenheap is
> exhausted by p2m tables.
> 
> This patch changes the layout of p2m table from xenheap to domheap. 
> The side effect is subtle performance down due to TLB miss.
> 
> A new boot option 'p2m_xenheap' enables the previous setting that p2m
> table is allocated in xenheap. 
> I dare to change the default for the future.
> 
> If there are no objections, please apply.

   Applied.  With this, I'm able to boot a 96GB system with over 95G
assigned to dom0.  I'm not sure why someone would want to do that, but
it's nice to remove the restriction ;^)  Thanks,

        Alex

-- 
Alex Williamson                             HP Open Source & Linux Org.


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