hi,all my environment is fc19, libvirt-1.0.5.8-1.fc19.x86_64 when systemctl start libvirtd.service , some warnning printed: Jan 09 17:53:01 localhost.localdomain libvirtd[12516]: libvirt version: 1.0.5.8, package: 1.fc19 (Fedora Project, 2013-12-14-21:10:58, buildv...ct.org) Jan 09 17:53:01 localhost.localdomain libvirtd[12516]: open("/var/run/libvirt/network/nwfilter.ltmp"): No such file or directory Jan 09 17:53:02 localhost.localdomain libvirtd[12516]: internal error Cannot find suitable CPU model for given data Jan 09 17:53:02 localhost.localdomain libvirtd[12516]: Failed to get host CPU --virsh sysinfo--- <processor> <entry name='socket_destination'>CPU 1</entry> <entry name='type'>Central Processor</entry> <entry name='family'>Other</entry> <entry name='manufacturer'>Bochs</entry> <entry name='version'>Not Specified</entry> <entry name='external_clock'>Unknown</entry> <entry name='max_speed'>2000 MHz</entry> <entry name='status'>Populated, Enabled</entry> </processor> ----proc/cpuinfo---------- processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 44 model name : Westmere E56xx/L56xx/X56xx (Nehalem-C) stepping : 1 microcode : 0x1 cpu MHz : 1861.999 cache size : 4096 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 11 wp : yes flags : fpu de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx lm constant_tsc nopl pni ssse3 cx16 sse4_1 sse4_2 x2apic popcnt aes hypervisor lahf_lm bogomips : 3723.99 clflush size : 64 cache_alignment : 64 address sizes : 44 bits physical, 48 bits virtual power management: