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 ? thks.