linux-kernel - Re: 3.1-rc2: CONFIG

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Message-ID: <CAM_iQpWPaavsa7gSURP5CL8+Es2P5rEdtLRmrOx+wQkThX7v9w@mail.gmail.com>
Date:	Thu, 18 Aug 2011 19:51:10 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
Cc:	linux-kernel@...r.kernel.org, linux-numa@...r.kernel.org,
	Alan Piszcz <ap@...arrain.com>
Subject: Re: 3.1-rc2: CONFIG_NUMA Question

On Thu, Aug 18, 2011 at 6:51 PM, Justin Piszcz <jpiszcz@...idpixels.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.

Thanks.
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