VirtualBox running Red Hat Guests
Recently I was using a Red Hat guest on my notebook’s VirtualBox, but with the VM started I noticed that one of my 2 core processor was lost, getting 60% to 100% of CPU load with the guest system totally idle. While testing the same VirtualBox with a Debian and an ArchLinux guest (simultaneously), the processor usage didn’t beat 10% of processor use with the guests idle.
Looking for some information on VirtualBox forums and on CentOS bugtracker, I found some information that shows up how to solve this problem in a very simple way, just changing the default divider kernel parameter to 10 (adjusting the system clock rate to 100Hz) directly at boot time.
Note: Since Red Hat Enterprise Linux 5.1 / CentOS 5.1 the default system clock rate that is set to 1000Hz and can be changed at boot time, with no need to recompile you kernel, remember that Xen guests don’t need the system clock rate to be modified because they already have a 250Hz kernel.
For those that are not familiar changing kernel parameters, just edit your grub menu.lst file (usually /boot/grub/menu.lst), add divider=10 in the end of the kernel line and reboot your system.
Ps. Sorry for the long time without new posts… Now I’m back!
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