Messages in this thread | | | Subject | Re: hackbench regression due to commit 9dfc6e68bfe6e | From | Eric Dumazet <> | Date | Thu, 08 Apr 2010 17:52:19 +0200 |
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Le jeudi 08 avril 2010 à 10:34 -0500, Christoph Lameter a écrit : > On Thu, 8 Apr 2010, Eric Dumazet wrote: > > > I suspect NUMA is completely out of order on current kernel, or my > > Nehalem machine NUMA support is a joke > > > > # numactl --hardware > > available: 2 nodes (0-1) > > node 0 size: 3071 MB > > node 0 free: 2637 MB > > node 1 size: 3062 MB > > node 1 free: 2909 MB > > How do the cpus map to the nodes? cpu 0 and 1 both on the same node?
one socket maps to 0 2 4 6 8 10 12 14 (Node 0) one socket maps to 1 3 5 7 9 11 13 15 (Node 1)
# numactl --cpubind=0 --membind=0 numactl --show policy: bind preferred node: 0 interleavemask: interleavenode: 0 nodebind: 0 membind: 0 cpubind: 1 3 5 7 9 11 13 15 1024
(strange 1024 report...)
# numactl --cpubind=1 --membind=1 numactl --show policy: bind preferred node: 1 interleavemask: interleavenode: 0 nodebind: membind: 1 cpubind: 0 2 4 6 8 10 12 14
[ 0.161170] Booting Node 0, Processors #1 [ 0.248995] CPU 1 MCA banks CMCI:2 CMCI:3 CMCI:5 CMCI:6 SHD:8 [ 0.269177] Ok. [ 0.269453] Booting Node 1, Processors #2 [ 0.356965] CPU 2 MCA banks CMCI:2 CMCI:3 CMCI:5 SHD:6 SHD:8 [ 0.377207] Ok. [ 0.377485] Booting Node 0, Processors #3 [ 0.464935] CPU 3 MCA banks CMCI:2 CMCI:3 CMCI:5 SHD:6 SHD:8 [ 0.485065] Ok. [ 0.485217] Booting Node 1, Processors #4 [ 0.572906] CPU 4 MCA banks CMCI:2 CMCI:3 CMCI:5 SHD:6 SHD:8 [ 0.593044] Ok. ... grep "physical id" /proc/cpuinfo physical id : 1 physical id : 0 physical id : 1 physical id : 0 physical id : 1 physical id : 0 physical id : 1 physical id : 0 physical id : 1 physical id : 0 physical id : 1 physical id : 0 physical id : 1 physical id : 0 physical id : 1 physical id : 0
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