公司大量的服务器使用了intel的网卡，主要是intel I350/82580/82576。 各个版本的igb驱动都出现过detected tx unix hang的报错。大部分是老版本igb的bug，更新到新版后基本都解决了。不过最近发现有几台I350（4端口）的升级了驱动还是存在这样的报错。Detected Tx Unit Hang in Quad Port Adapters http://downloadmirror.intel.com/20927/eng/e1000.htmIn some cases ports 3 and 4 don’t pass traffic and report ‘Detected Tx Unit Hang’ followed by‘NETDEV WATCHDOG: ethX: transmit timed out’ errors. Ports 1 and 2 don’t show any errors and will pass traffic.This issue MAY be resolved by updating to the latest kernel and BIOS. The user is encouraged to run anOS that fully supports MSI interrupts. You can check your system’s BIOS by downloading the LinuxFirmware Developer Kit that can be obtained at http://www.linuxfirmwarekit.org/
===这个问题现在发现还是存在，设置了这个内核参数没有起到作用。原因待继续排查。。。。。