From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.fraser@eu.citrix.com>
Subject: Re: Fw: bigphysarea patch on xen capable linux
Date: Tue, 12 Jan 2010 21:10:58 +0000
Message-ID: <C77295E2.62E0%keir.fraser@eu.citrix.com>
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To: "Kashmira. K." <chimnee@yahoo.com>, Jan Beulich <JBeulich@novell.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
List-Id: xen-devel@lists.xenproject.org

You can increase MAX_CONTIG_ORDER and then it could work. The cost is a
larger kernel image size for the enlarged static arrays defined immediately
above xen_create_contiguous_region().

 -- Keir

On 12/01/2010 20:49, "Kashmira. K." <chimnee@yahoo.com> wrote:

>=20
> Hi Jan,
>=20
> 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.=20
>=20
> 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.
>=20
> Thanks
> Kashmira
>=20
> --- On Tue, 1/12/10, Jan Beulich <JBeulich@novell.com> wrote:
>=20
>> From: Jan Beulich <JBeulich@novell.com>
>> Subject: Re: [Xen-devel] Fw: bigphysarea patch on xen capable linux
>> To: "Kashmira. K." <chimnee@yahoo.com>
>> Cc: xen-devel@lists.xensource.com
>> Date: Tuesday, January 12, 2010, 12:53 AM
>>>>> "Kashmira. K." <chimnee@yahoo.com>
>> 08.01.10 02:10 >>>
>>> 1. Is the bigphysarea patch supported on Xen capable
>>> linux?=A0 If not what is the maximum physically
>>> contiguous memory Xen provides.
>>=20
>> 2Mb is the maximum you can create.
>> =20
>>> 2. If I were to run my application in DomU instead of
>> Dom0,
>>> can the bigphysarea patch=A0 be used then.
>>=20
>> In a fully virtualized DomU this should be possible (unless
>> you imply to
>> be able to use 1G pages).
>>=20
>> Jan
>>=20
>>=20
>=20
>=20
>      =20
>=20
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