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 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel