Messages in this thread | | | Subject | Re: hackbench regression due to commit 9dfc6e68bfe6e | From | Eric Dumazet <> | Date | Thu, 08 Apr 2010 07:39:13 +0200 |
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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
# cat try.sh hackbench 50 process 5000 numactl --cpubind=0 --membind=0 hackbench 25 process 5000 >RES0 & numactl --cpubind=1 --membind=1 hackbench 25 process 5000 >RES1 & wait echo node0 results cat RES0 echo node1 results cat RES1
numactl --cpubind=0 --membind=1 hackbench 25 process 5000 >RES0_1 & numactl --cpubind=1 --membind=0 hackbench 25 process 5000 >RES1_0 & wait echo node0 on mem1 results cat RES0_1 echo node1 on mem0 results cat RES1_0
# ./try.sh Running with 50*40 (== 2000) tasks. Time: 16.865 node0 results Running with 25*40 (== 1000) tasks. Time: 16.767 node1 results Running with 25*40 (== 1000) tasks. Time: 16.564 node0 on mem1 results Running with 25*40 (== 1000) tasks. Time: 16.814 node1 on mem0 results Running with 25*40 (== 1000) tasks. Time: 16.896
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