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Topic Title: AMD Opteron 6238 numanode topology
Topic Summary: What is the topology of 6238?
Created On: 04/19/2012 03:39 AM
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Answer This question was answered by p3tris, on Thursday, April 19, 2012 7:24 AM

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question answered...
 04/19/2012 03:39 AM
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p3tris
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Hi,

I run lstopo on my 4-socket 6238, Supermicro system and I get the following figure:
lstopo graphic and lstopo verbose.

It shows that each socket has 2 numanodes with 6 cores each. It shows a shared L3 memory but dedicated L2 and L1. In other references, like here, here and here, I get that L1 is dedicated, L2 is shared by 2 cores and L3 shared by all 6 in the numanode.

What's the truth? Is lstopo wrongly reporting that?

I am running the latest stable version of Debian Linux (6.0.4 Squeeze) and have hwloc v1.4.1.

Any insight is welcome!

Petros

Edited: 04/19/2012 at 03:50 AM by p3tris
 04/19/2012 07:21 AM
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p3tris
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I found it's known problem because of the kernel I use: https://bugzilla.kernel.org/show_bug.cgi?id=42607

Upgraded to Kernel 3.2 and I get the right one:

kernel 3.2 lstopo
 04/19/2012 07:24 AM
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p3tris
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