Xen users - Sep 2010 - Questions about 1000HZ Kernel

Hello,

The XEN kernel in "XEN RELEASE-4.0.1" is shipped with the following
config parameters:

CONFIG_HZ_1000=y
CONFIG_HZ=1000

At many blogs and forums there is a discussion that the CONFIG_HZ
parameter should be changed to 250 HZ or 300 HZ.

We will operate a DomU and the Dom0 with the same 1000HZ Kernel. Is this
setup possible and recommended. How high is the performance cut-off?

Which option is more suitable for Xen systems?


Thanks,

Christian



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On Tue, Sep 21, 2010 at 11:51:02AM +0200, Christian Maile
wrote:
> Hello,
> 
> The XEN kernel in "XEN RELEASE-4.0.1" is shipped with the
following
> config parameters:
> 
> CONFIG_HZ_1000=y
> CONFIG_HZ=1000
> 
> At many blogs and forums there is a discussion that the CONFIG_HZ
> parameter should be changed to 250 HZ or 300 HZ.
> 
> We will operate a DomU and the Dom0 with the same 1000HZ Kernel. Is this
> setup possible and recommended. How high is the performance cut-off?
> 
There''s no need to use the same kernel in dom0 and domUs.
> Which option is more suitable for Xen systems?
> 
Depends on what you need :)

-- Pasi


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