sysstat 查看系统负载，里面有cpu占用和中断，上下文切换等信息
iostat 查看io负载，主要是读写次数速度cpu占用等
sar 比较强大的命令，啥都可以看，我一般用来看中断，sar -I XALL -d 3 10
或者从 /proc/interrupts 看
今天重新打开了服务器上面的irqbalance， 不知道从什么时候开始我就把这个服务给k掉了。
网卡比较繁忙，不知道是不是这里引起服务器负载过高，先观察下。
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