[Xen-devel] The Xenoprof results

[suixiufeng <suixiufeng@xxxxxxxxx>]

Hi, All:

The dom0 kernel is centos5.5, and the Hypervisor is xen-4.1.2. The domU kernel is centos5.5, which is installed through the virt-install command (I think it belongs to HVM).   

Then I use xenoprof to collect the cycle, retired instruction number, LLC access number and LLC miss number information when running spec cpu 2006 benchmarks.

I collected data for the whole system, and I only compared the speccpu process. For xenoprof, I use active domain method, and collect data on both dom0 and domU. But only domU has the performance information about speccpu in VM.

Furthermore, there are a 30x difference with regard to the  retired instruction number which are shown in the following. I wonder what is the reason? I think it is due to xen virtulization. Thank you!

PM
	Cycles	Insts	MISSES	REFS	CPI	MissRate
gromacs_base.i386	6198401	4458151	106	8865	1.390352413	0.011957135
sjeng_base.i386	2848717	3031079	911	2724	0.939835946	33.4%
VM
gromacs_base.i386	295398087	151265683	33934	329494	1.952842714	0.102988218
sjeng_base.i386	167443975	106367653	52282	195747	1.574200147	0.267089662

PM
	Cycles	Insts	MISSES	REFS	CPI	MissRate
soplex_base.i386	922165	760142	2594	13903	1.213148333	0.186578436
mcf_base.i386	50646	8478	276	451	5.973814579	0.611973392
VM
soplex_base.i386	41082192	23311208	57588	284211	1.762336469	0.202624107
mcf_base.i386	81967004	39434857	147411	778654	2.078541936	0.189315152

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