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how to disabling linux ksoftirqd kernel thread



I am using linux as a bridge in a server. when the traffic is about 5 Gbps, the CPU is 10% used, and ksoftirqd is 0% used.
But when the traffic is increased to 6 Gbps, the CPU is 80~100% used, and ksoftirqd is almost 100% used.
So it is the ksoftirqd that eats my CPU, i think.
Is there any one know how to disable ksoftirqd kernel thread ?

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