Hi I have met an interesting problem between different kvm&linux version. Both the two run on the same platform. HW Platform: Processors | physical = 2, cores = 8, virtual = 16, hyperthreading = yes Speeds | 16x2266.804 Models | 16xIntel(R) Xeon(R) CPU E5520 @ 2.27GHz Caches | 16x8192 KB Memory | 23.54G OS | CentOS 5 Configuration 1: Configuration:2 Kernel | 2.6.18-194.el5 Kernel | 2.6.32-71.24.1.el6.x86_64 Architecture | CPU = 64-bit, OS = 64-bit KVM | kvm-83-164.el5_5.23 KVM | Follow kernel's version Guest: Configuration 1: Configuration:2 Platform | Windows Release | Windows Server 2003 Enterprise Edition SP2 Processors | SMP=4 Processor | SMP=2 Memory | 4G I run the wprime in the Guest; From Guest's Task Manager, the CPU Usage is 100% In both Configurations, the corresponding PCPU is 100% too from Linux Host's top view. And in Configuration 1, the PCPU's cpu time is nearly 100% in sys space. But in Configuration 2, the situation is totally reversed, the PCPU's time is nearly 100% in Usr space. Could anyone tell me the reason? Thank you very much! Best Regards Peijie Yu -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html