Messages in this thread | | | From | "Luck, Tony" <> | Subject | RE: [PATCH 1/3] mce: Add a msg string to the MCE tracepoint | Date | Wed, 29 Feb 2012 17:33:51 +0000 |
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> IOW, we want to assume that cores 0, 1, 2 ... k-1 are on node 0; k, k+1 > ... 2k-1 belong to node 1, etc., where k is the number of cores on a > socket and thus we have a regular core enumeration on the box.
Sounds dubious:
Booting Node 0, Processors #1 #2 #3 #4 #5 #6 #7 Ok. Booting Node 1, Processors #8 #9 #10 #11 #12 #13 #14 #15 Ok. Booting Node 0, Processors #16 #17 #18 #19 #20 #21 #22 #23 Ok. Booting Node 1, Processors #24 #25 #26 #27 #28 #29 #30 #31 Brought up 32 CPUs
Now those are logical cpu numbers, and we brought up the first HT thread on each core first, and then came around for a 2nd pass bringing up the other HT thread. This order is determined by how the BIOS lists the cpus (and in this case it seems to be doing so according to recommendations) - so here our core numbers will match what you said. But the BIOS could do something strange and list logical cpus alternating between sockets. In which case cores 0, 2, 4, 6 ... would be on node 0, and cores 1, 3, 5, 7, ... on node 1.
-Tony
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