Messages in this thread | | | Date | Thu, 18 Aug 2011 07:59:26 -0400 (EDT) | From | Justin Piszcz <> | Subject | 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@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, 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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