Re: 3.1-rc2: CONFIG_NUMA Question

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On Thu, 18 Aug 2011, Américo Wang wrote:

On Thu, Aug 18, 2011 at 6:51 PM, Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx> wrote:
Hi,

I have a SuperMicro X8DTH-6F motherboard with 2 cpus it has NUMA options in
the BIOS; what parameters/should I be using for the NUMA options in the
kernel?

 | |    [*] Numa Memory Allocation and Scheduler Support                 | |
 | |    [ ] Old style AMD Opteron NUMA detection                         | |
 | |    [*] ACPI NUMA detection                                          | |
 | |    [ ] NUMA emulation                                               | |
 | |    (6) Maximum NUMA Nodes (as a power of 2)                         | |


That is Intel processor, right? If so, the things you selected here are enough,
Hi, yes-- two Intel Xeon E5645s.

the rest two is not what you need.
Ok.


Specifically, the maximum number of NUMA nodes?  Will this help to increase
performance of large memory allocations/is there any downside
to enabling this feature?

The max of NUMA nodes is specified by CONFIG_NODES_SHIFT,
in your case, it is 6, which means it supports up to 2^6 nodes.
Ok, is there any overhead having more than is needed?


If your hardware supports NUMA, yes, that certainly help to increase
the performance.
Nice, thanks.

Justin.

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