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vim /etc/grub.conf
Change default=0 to default=1
The sequence of serial numbers is based on your rpm -qa | grep kernel results, starting from 0, so when you switch to kernel-ml-4.6.0-1.el7.elrepo.x86_64 it is 1
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vim /etc/grub.conf
Change default=0 to default=1
The sequence of serial numbers is based on your rpm -qa | grep kernel results, starting from 0, so when you switch to kernel-ml-4.6.0-1.el7.elrepo.x86_64 it is 1