Re: Xen 3.4.1 NUMA support

[Juergen Gross <juergen.gross@ts.fujitsu.com>]

Cpupools? :-)

NUMA was a topic I wanted to look at as soon as cpupools are officially
accepted. Keir wanted to propose a way to get rid of the function
continue_hypercall_on_cpu() which was causing most of the stuff leading
to the objection of cpupools.
I guess Keir had some higher priority jobs. :-)
So I will try a new patch for cpupools without continue_hypercall_on_cpu()
and perhaps with NUMA support.
George, would this be okay for you? I think your scheduler still will have
problems with domain weights as long as domains are restricted to some
processors, right?

Juergen

George Dunlap wrote:
> I haven't had time to look at NUMA stuff at all.  I probably will look
> at it eventually, if no one else does, but I'd be happy if someone else
> could pursue it.
> 
> -George
> 
> Dan Magenheimer wrote:
>> VMware has the notion of a "cell" where VMs can be
>> scheduled only within a cell, not across cells.
>> Cell boundaries are determined by VMware by
>> default, though certains settings can override them.
>>
>> An interesting project might be to implement
>> "numa=cell" for Xen.... or maybe something similar
>> is already in George Dunlap's scheduler plans?
>>
>>  
>>> -----Original Message-----
>>> From: Keir Fraser [mailto:keir.fraser@eu.citrix.com]
>>> Sent: Wednesday, November 04, 2009 5:33 AM
>>> To: Papagiannis Anastasios; xen-devel@lists.xensource.com
>>> Subject: Re: [Xen-devel] Xen 3.4.1 NUMA support
>>>
>>>
>>> Add Xen boot parameter 'numa=on' to enable NUMA detection. Then it's
>>> up to
>>> you to, for example, pin domains to specific nodes, using the 'cpus=...'
>>> option in the domain config file. See /etc/xen/xmexample1 for an
>>> example of
>>> its usage.
>>>
>>>  -- Keir
>>>
>>> On 04/11/2009 12:02, "Papagiannis Anastasios" <apapag@ics.forth.gr>
>>> wrote:
>>>
>>>    
>>>> Hello,
>>>>
>>>> does the last version of Xen(3.4.1) support NUMA machines?       
>>> Is there a .pdf
>>>    
>>>> or a link that can give me some more details about that? I work on a
>>>> project for xen performace in numa machines. And in xen 3.3.0 this
>>>> performance isn't good. Have something changed in last version?
>>>>
>>>> Thanks in advance,
>>>> Papagiannis Anastasios
>>>>
>>>>
>>>> _______________________________________________
>>>> Xen-devel mailing list
>>>> Xen-devel@lists.xensource.com
>>>> http://lists.xensource.com/xen-devel
>>>>       
>>>
>>> _______________________________________________
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>>>
>>>     
> 
> 
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> 
> 


-- 
Juergen Gross                 Principal Developer Operating Systems
TSP ES&S SWE OS6                       Telephone: +49 (0) 89 636 47950
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