[CentOS-virt] High CPU usage when running a CentOS guest in VirtualBox

Mon Jul 6 15:44:35 UTC 2009
Akemi Yagi <amyagi at gmail.com>

On Mon, Jul 6, 2009 at 8:31 AM, Sagi Bashari<sagi at boom.org.il> wrote:
> Hi,
> I am running CentOS 5.3 32bit as a VirtualBox 3.0.0 guest running on Windows XP.
> The Windows host CPU usage is constantly at 50% although the CentOS
> guest is completely idle (i.e. 0.00 load average).
> I know this is a common problem related to the 1000Hz frequency that
> the CentOS kernel runs at. With previous versions of CentOS, I used
> the kernel-vm package [1] and it solved my problem. However, according
> to the README [2] this isn't necessary as of CentOS 5.3 and therefore
> these packages are not maintained anymore (the latest released
> kernel-vm is 2.6.18-92.1.22).
> >From what I understand, as of CentOS 5.3 it is possible to use the
> "divider=10 clocksource=acpi_pm" to reduce the frequency to 100Hz. I
> tried this setting, and it made no difference at all.

This is interesting.  Could you please try installing the regular
2.6.18-92.1.22 kernel and use the "divider=10 clocksource=acpi_pm"
option?  This is the only way to compare the kernel-vm and the distro
kernel.  Currently, the difference you are seeing could be due to the
fact kernel-vm was from 5.2 and the distro one was from 5.3.