Xen devel - Jul 2011 - xl miss the logic of memory allocation on NUMA platform

Hi Stefano
In our recently experience, we found xl doesn''t have the memory
allocation logic on NUMA platform. It will allocate the memory from every node
when creating guest:
(XEN) Domain 4 (total: 261112):
(XEN)     Node 0: 64894
(XEN)     Node 1: 65406
(XEN)     Node 2: 65406
(XEN)     Node 3: 65406

For xm, it will allocate the memory on the node where the guest cpu reside:
1348 (XEN) Domain 3 (total: 263160):
1349 (XEN)     Node 0: 0
1350 (XEN)     Node 1: 0
1351 (XEN)     Node 2: 0
1352 (XEN)     Node 3: 263160

Is there a plan to add this logic to xl?

best regards
yang



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On Thu, 28 Jul 2011, Zhang, Yang Z wrote:
> Hi Stefano
> In our recently experience, we found xl doesn''t have the memory
allocation logic on NUMA platform. It will allocate the memory from every node
when creating guest:
> (XEN) Domain 4 (total: 261112):
> (XEN)     Node 0: 64894
> (XEN)     Node 1: 65406
> (XEN)     Node 2: 65406
> (XEN)     Node 3: 65406
> 
> For xm, it will allocate the memory on the node where the guest cpu reside:
> 1348 (XEN) Domain 3 (total: 263160):
> 1349 (XEN)     Node 0: 0
> 1350 (XEN)     Node 1: 0
> 1351 (XEN)     Node 2: 0
> 1352 (XEN)     Node 3: 263160
> 
> Is there a plan to add this logic to xl?
I think we forgot about this feature but it is important and hopefully
somebody will write a patch for it before 4.2 is out.

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On Thu, Jul 28, 2011 at 12:26:06PM +0100, Stefano Stabellini
wrote:
> On Thu, 28 Jul 2011, Zhang, Yang Z wrote:
> > Hi Stefano
> > In our recently experience, we found xl doesn''t have the
memory allocation logic on NUMA platform. It will allocate the memory from every
node when creating guest:
> > (XEN) Domain 4 (total: 261112):
> > (XEN)     Node 0: 64894
> > (XEN)     Node 1: 65406
> > (XEN)     Node 2: 65406
> > (XEN)     Node 3: 65406
> > 
> > For xm, it will allocate the memory on the node where the guest cpu
reside:
> > 1348 (XEN) Domain 3 (total: 263160):
> > 1349 (XEN)     Node 0: 0
> > 1350 (XEN)     Node 1: 0
> > 1351 (XEN)     Node 2: 0
> > 1352 (XEN)     Node 3: 263160
> > 
> > Is there a plan to add this logic to xl?
> 
> I think we forgot about this feature but it is important and hopefully
> somebody will write a patch for it before 4.2 is out.
> 
I just added a note about this to Xen 4.1 release notes:
http://wiki.xen.org/xenwiki/Xen4.1

-- Pasi


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Ok, I will submit a patch later.

best regards
yang
> -----Original Message-----
> From: Stefano Stabellini [mailto:stefano.stabellini@eu.citrix.com]
> Sent: Thursday, July 28, 2011 7:26 PM
> To: Zhang, Yang Z
> Cc: Stefano Stabellini; xen-devel@lists.xensource.com
> Subject: Re: xl miss the logic of memory allocation on NUMA platform
> 
> On Thu, 28 Jul 2011, Zhang, Yang Z wrote:
> > Hi Stefano
> > In our recently experience, we found xl doesn''t have the
memory allocation
> logic on NUMA platform. It will allocate the memory from every node when
> creating guest:
> > (XEN) Domain 4 (total: 261112):
> > (XEN)     Node 0: 64894
> > (XEN)     Node 1: 65406
> > (XEN)     Node 2: 65406
> > (XEN)     Node 3: 65406
> >
> > For xm, it will allocate the memory on the node where the guest cpu
reside:
> > 1348 (XEN) Domain 3 (total: 263160):
> > 1349 (XEN)     Node 0: 0
> > 1350 (XEN)     Node 1: 0
> > 1351 (XEN)     Node 2: 0
> > 1352 (XEN)     Node 3: 263160
> >
> > Is there a plan to add this logic to xl?
> 
> I think we forgot about this feature but it is important and hopefully
somebody
> will write a patch for it before 4.2 is out.
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On Mon, 1 Aug 2011, Zhang, Yang Z wrote:
> Ok, I will submit a patch later.
great :-)


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