Re: [Xen-devel] Memory allocation in NUMA system

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 25/7/08 08:51, "Yang, Xiaowei" <xiaowei.yang@xxxxxxxxx> wrote:

>> How about by default we guarantee no more than 25% of a node's memory is
>> classed as 'DMA memory', and we reduce the DMA address width variable in Xen
>> to ensure that?
>> 
>> So, in your example, we would reduce dma_bitsize to 30.
>> 
>>  -- Keir
>> 
>> 
> Yes, a good suggestion!

Indeed the only reason we still have dma_bitsize is to break the
select-NUMA-node-first memory allocation search strategy. So tweaking the
dma_bitsize approach further to strike the correct NUMA-vs-DMA balance does
seem the right thing to do. Feel free to work up a patch.

 -- Keir




_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel