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Re: [Xen-users] High Oracle overhead with Xen 4.1.2



Guest OS: CentOS 5.6 (Linux 2.6.18-238.el5) with 12 GB memory and 4 vcpus
Is it  2.6.18-238.el5 or  2.6.18-238.el5xen?

Can you try to do a cpu pinning for all vcpus onto real cpus?


2012/3/16 AP <apxeng@xxxxxxxxx>:
> I am trying to move a workload from bare metal on to a Xen VM. Prior
> to doing that I decided to do some performance benchmarks using
> Hammerora (http://hammerora.sourceforge.net/).
> The following is the details of the configuration/results of an
> experiment to determine the overhead of XEN. The tests were run on the
> same hardware. I am seeing a high overhead with Xen. I realize there
> will be a IO penalty so I moved all the redo logs in to memory. I do
> understand there will be a VM scheduling penalty with Xen but should
> it be in the 30-40% range? Does anyone have any insight in to this?


the purpose of libvirt is to provide an abstraction layer hiding all
xen features added since 2006 until they were finally understood and
copied by the kvm devs.

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