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    SubjectRe: hackbench regression due to commit 9dfc6e68bfe6e
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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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