cpu usage - NUMA domain(Equal node binding among All the processes) can not increase throughput why? -

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i have run 15 processes on linux system. system architecture have 40 core cpu on 2 node(0 , 1). each process contains 2 application threads.

without doing numa node binding processes, have achieved 92% cpu utilization specific load on processes.

with numa node binding(8 process on node 0 , 7 process on node 1) of processes; system not able handle more load above scenario while cpu utilization less(85%) in scenario. why system can not able handle more load cpu utilization less previous scenario?


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