修复内核版本低于2.6.33时取不到net.if.speed.bits值的问题 #15
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…ce in/out speed percent when kernel version lower than 2.6.33
mdh67899
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pr 9 中实现了抓取网卡参数:
net.if.speed.bits，net.if.in.percent，net.if.out.percent的功能，当内核版本低于2.6.33时是不存在/sys/class/net/<nic>/speed文件的，doc in here, 此时无法获取到网卡的真实值当内核版本低于
2.6.33时， 可以使用ethtool命令来实现这个功能，已经在线上机器CentOS 5.5 Kernel version 2.6.18的环境中验证生效