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KVM libvirt的CPU热添加
1、CentOS7.3：
需求：说明:默认有两个cpu，由于压力较大的情况下，需要在线添加一个1个cpu
添加cpu前，查看cpu信息
[root@localhost ~]# cat /proc/cpuinfo processor: 0 vendor_id: GenuineIntel cpu family: 6 model: 58 model name: Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz stepping: 9 microcode: 0x1 cpu MHz: 2494.342 cache size: 4096 KB physical id: 0 siblings: 1 core id: 0 cpu cores: 1 apicid: 0 initial apicid: 0 fpu: yes fpu_exception: yes cpuid level: 13 wp: yes flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx rdtscp lm constant_tsc arch_perfmon rep_good nopl pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm fsgsbase tsc_adjust smep bogomips: 4988.68 clflush size: 64 cache_alignment: 64 address sizes: 42 bits physical, 48 bits virtual power management:
在线添加cpu信息：
virsh setvcpus CentOS-7.3-X86_64 2 --live (将cpu的在线个数调整为3个）
添加后进行比对：
[root@localhost ~]# cat /proc/cpuinfo processor: 0 vendor_id: GenuineIntel cpu family: 6 model: 58 model name: Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz stepping: 9 microcode: 0x1 cpu MHz: 2494.342 cache size: 4096 KB physical id: 0 siblings: 1 core id: 0 cpu cores: 1 apicid: 0 initial apicid: 0 fpu: yes fpu_exception: yes cpuid level: 13 wp: yes flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx rdtscp lm constant_tsc arch_perfmon rep_good nopl pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm fsgsbase tsc_adjust smep bogomips: 4988.68 clflush size: 64 cache_alignment: 64 address sizes: 42 bits physical, 48 bits virtual power management: processor: 1 vendor_id: GenuineIntel cpu family: 6 model: 58 model name: Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz stepping: 9 microcode: 0x1 cpu MHz: 2494.342 cache size: 4096 KB physical id: 1 siblings: 1 core id: 0 cpu cores: 1 apicid: 1 initial apicid: 1 fpu: yes fpu_exception: yes cpuid level: 13 wp: yes flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx rdtscp lm constant_tsc arch_perfmon rep_good nopl pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm fsgsbase tsc_adjust smep bogomips: 4988.68 clflush size: 64 cache_alignment: 64 address sizes: 42 bits physical, 48 bits virtual power management: [root@localhost ~]# cat /proc/interrupts CPU0 CPU1 0: 679 0 IO-APIC-edge timer 1: 10 0 IO-APIC-edge i8042 6: 3 0 IO-APIC-edge floppy 8: 0 0 IO-APIC-edge rtc0 9: 1 0 IO-APIC-fasteoi acpi 10: 28 0 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb2 11: 2930 0 IO-APIC-fasteoi uhci_hcd:usb3, uhci_hcd:usb4, virtio3 12: 15 0 IO-APIC-edge i8042 14: 3348 0 IO-APIC-edge ata_piix 15: 0 0 IO-APIC-edge ata_piix 24: 0 0 PCI-MSI-edge virtio0-config 25: 1707 0 PCI-MSI-edge virtio0-input.0 26: 1 0 PCI-MSI-edge virtio0-output.0 27: 0 0 PCI-MSI-edge virtio2-config 28: 5807 0 PCI-MSI-edge virtio2-req.0 29: 0 0 PCI-MSI-edge virtio1-config 30: 3 0 PCI-MSI-edge virtio1-virtqueues NMI: 0 0 Non-maskable interrupts LOC: 74004 208 Local timer interrupts SPU: 0 0 Spurious interrupts PMI: 0 0 Performance monitoring interrupts IWI: 5362 6 IRQ work interrupts RTR: 0 0 APIC ICR read retries RES: 20 61 Rescheduling interrupts CAL: 0 89 Function call interrupts TLB: 0 3 TLB shootdowns TRM: 0 0 Thermal event interrupts THR: 0 0 Threshold APIC interrupts DFR: 0 0 Deferred Error APIC interrupts MCE: 0 0 Machine check exceptions MCP: 12 1 Machine check polls ERR: 0 MIS: 0 PIN: 0 0 Posted-interrupt notification event PIW: 0 0 Posted-interrupt wakeup event
2、Win2012：
setvcpus win2012 2 --live 不需要进行激活操作，系统会自动识别新的CPU
3、注意事项
a、KVM虚拟化不能在线减少CPU，cpu热添加技术适合不能停机但是cpu性能严重不足的场景
b、CPU热添加的技术对宿主机以及虚拟机操作系统版本要求较高
c、CPU热添加，总数不能大于最大CPU个数
<vcpu placement=‘auto‘ current=‘1’>4</vcpu>
本文出自 “冰冻vs西瓜” 博客，请务必保留此出处http://molewan.blog.51cto.com/287340/1926139
KVM libvirt的CPU热添加
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