ubuntu

在如下的网站查找想升级到的内核版本：

http://kernel.ubuntu.com/~kernel-ppa/mainline

下面以4.15.2版本为例：

http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15.2/

找到amd64对应的一段：

Build for amd64 succeeded (see BUILD.LOG.amd64):
linux-headers-4.15.2-041502_4.15.2-041502.201802072230_all.deb
linux-headers-4.15.2-041502-generic_4.15.2-041502.201802072230_amd64.deb
linux-headers-4.15.2-041502-lowlatency_4.15.2-041502.201802072230_amd64.deb
linux-image-4.15.2-041502-generic_4.15.2-041502.201802072230_amd64.deb
linux-image-4.15.2-041502-lowlatency_4.15.2-041502.201802072230_amd64.deb

分别执行如下的命令下载最新内核相关的deb包：

sudo wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15.2/linux-headers-4.15.2-041502_4.15.2-041502.201802072230_all.deb
sudo wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15.2/linux-headers-4.15.2-041502-generic_4.15.2-041502.201802072230_amd64.deb
sudo wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15.2/linux-image-4.15.2-041502-generic_4.15.2-041502.201802072230_amd64.deb

在执行如下命令安装最新内核：

sudo dpkg -i *.deb

安装完成后，重启系统，uname -sr查看是否是最新的内核。

centos/redhat

依次执行以下的命令：

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
yum --disablerepo="*" --enablerepo="elrepo-kernel" list available
yum --enablerepo=elrepo-kernel install kernel-ml
yum --enablerepo=elrepo-kernel install kernel-ml-devel

重启之后，执行 uname -sr 检查是否是最新内核。