On 12/07/2012 10:04 PM, Shawn Everett wrote:
Hi All,
I have recently installed CentOS 6.3 with QEMU+KVM for Virtualization.
I have successfully created a Windows 2003 VM with 4GB of RAM. The host server is an HP ML350 G8 with 24GB RAM and 24 cores. Details of one of the cores is shown below:
processor : 23 vendor_id : GenuineIntel cpu family : 6 model : 45 model name : Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz stepping : 7 cpu MHz : 1200.000 cache size : 15360 KB physical id : 1 siblings : 12 core id : 5 cpu cores : 6 apicid : 43 initial apicid : 43 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 x2apic popcnt aes xsave avx lahf_lm ida arat epb xsaveopt pln pts dts tpr_shadow vnmi flexpriority ept vpid bogomips : 3989.86 clflush size : 64 cache_alignment : 64 address sizes : 46 bits physical, 48 bits virtual power management:
On an otherwise completely idle system I've noticed the load to be 1.0 to 1.5 range. Running "top" shows the culprit to be: qemu-kvm.
Is this normal behavior? I would have expected the load to be pretty light.
Stopping the VM restores the load to normal once again.
Is there anything I can do to reduce the load?
You probably have 12 cores and thanks to hyper-threading that gives you 24 threads (big difference). Have you installed the virtio drivers in the VM? That might reduce the load a bit. Also was does running "vmstat 3" for about 20 seconds show?
Regards, Dennis