On Wed, Mar 17, 2010 at 02:10:11PM -0300, Martinx - ?$B%8%'!<%`%: wrote:
> Hi!
>
> The kernel shipped by Citrix for Debian via xen-tools are configured with
> CONFIG_HZ_100=y, but the Debian kernels and my custom kernels are
> configured for CONFIG_HZ_250=y or even CONFIG_HZ_1000=y.
>
> So, what is the impact of this clock to a Xen system?
>
> Which option is more suitable for Xen systems?
>
This is really common for all virtualized environments, so it also applies
to VMware etc.
Your _guest_ kernel should have HZ=100 rather than HZ=1000. HZ=100 will use
a lot less CPU time when the guest is idle.
-- Pasi
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