From: Keir Fraser <keir.fraser@eu.citrix.com>
To: "Kashmira. K." <chimnee@yahoo.com>, Jan Beulich <JBeulich@novell.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: Re: Fw: bigphysarea patch on xen capable linux
Date: Tue, 12 Jan 2010 21:10:58 +0000 [thread overview]
Message-ID: <C77295E2.62E0%keir.fraser@eu.citrix.com> (raw)
In-Reply-To: <160485.17229.qm@web50605.mail.re2.yahoo.com>
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:
>
> 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@novell.com> wrote:
>
>> 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? 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
>>
>>
>
>
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
prev parent reply other threads:[~2010-01-12 21:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-08 1:10 Fw: bigphysarea patch on xen capable linux Kashmira. K.
2010-01-12 8:53 ` Jan Beulich
2010-01-12 20:49 ` Kashmira. K.
2010-01-12 21:10 ` Keir Fraser [this message]
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