Messages in this thread | | | Date | Thu, 18 Aug 2011 19:51:10 +0800 | Subject | Re: 3.1-rc2: CONFIG_NUMA Question | From | Américo Wang <> |
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On Thu, Aug 18, 2011 at 6:51 PM, Justin Piszcz <jpiszcz@lucidpixels.com> 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, the rest two is not what you need.
> 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.
If your hardware supports NUMA, yes, that certainly help to increase the performance.
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