Re: [Xen-devel] Fw: bigphysarea patch on xen capable linux

["Kashmira. K." <chimnee@xxxxxxxxx>]

Hi Jan,

I looked at the linux code xen_create_contiguous_region(). It appears the 2MB 
limit comes from the #define MAX_CONIG_ORGER 9. Could that be modified to get 
more than 2MB. 

If not would you have other suggestions of how I can I get around 500M or more 
of physically contiguous memory on Xen in Dom0 linux. 

Thanks
Kashmira

--- On Tue, 1/12/10, Jan Beulich <JBeulich@xxxxxxxxxx> wrote:

> From: Jan Beulich <JBeulich@xxxxxxxxxx>
> Subject: Re: [Xen-devel] Fw: bigphysarea patch on xen capable linux
> To: "Kashmira. K." <chimnee@xxxxxxxxx>
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Date: Tuesday, January 12, 2010, 12:53 AM
> >>> "Kashmira. K." <chimnee@xxxxxxxxx>
> 08.01.10 02:10 >>>
> > 1. Is the bigphysarea patch supported on Xen capable
> > linux?  If not what is the maximum physically
> > contiguous memory Xen provides.
> 
> 2Mb is the maximum you can create.
>  
> > 2. If I were to run my application in DomU instead of
> Dom0,
> > can the bigphysarea patch  be used then.
> 
> In a fully virtualized DomU this should be possible (unless
> you imply to
> be able to use 1G pages).
> 
> Jan
> 
> 




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