[Beowulf] bizarre scaling behavior on a Nehalem

Rahul Nabar rpnabar at gmail.com
Wed Aug 12 10:58:38 PDT 2009

On Wed, Aug 12, 2009 at 10:14 AM, Mikhail Kuzminsky<kus at free.net> wrote:
> As I mentioned here in "numactl&SuSE11.1' thread, on some kernels there is
> wrong behaviour for Nehalem (bad /sys/devices/system/node directory
> content). This bug is presented, in particular, in default OpenSuSE 11
> kernels ( and 2.6.29-6), and (as it was writted in the
> corresponding thread discussion) in FC11 2.6.29 kernel.

Is there a way to check if I have this bug?

ls /sys/devices/system/node/
node0  node1

Don't know what exactly is "bad content" in here. I'll see if I can
find a bug report online.

> It's interesting, do somebody have "normally working" w/Nehalem - in the
> sense of NUMA - kernels ? AFAIK more old 2.6 kernels (from SuSE 10.3) works
> OK, but I didn't check. May be error in NUMA support is the reason of Rahul
> problem ?

Any way to test? Are there any NUMA support tests or benchmarks?


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