Libvirt-Host-Guest-cpu-isolation

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1、KVMHost/GuestCPUIsolationHongminghongmingzhang@126.com2012.10.191KVMHost/GuestCPUisolation●Host/Guestcpupinningisolation●Bug822064-[FEATRHEL6.4]:libvirt:KVMhost/guestcpuisolation●Host/Guestcpucappingisolation●Bug822090-[FEATRHEL6.4]:libvirt:KVMhost/guestcpucappingisolation2Host/G

2、uestCPUpinningisolation●Featuredescription●Allowtopinemulatorthreadstospecifiedphysicalcpus.●RHEL6.3onlyallowstopinguest'svcpustospecifiedphysicalcpus●Whyisthefeatureneeded?●Performancetuning/forecast,Candoinotherhypervisor(Xen,VMware...)3QEMU/KVMProcess●KVMusesaslightlymodifiedQ

3、EMUprogramtoinstantiatethevirtualmachine.Oncerunning,avirtualmachineisjustaregularprocess.●Use`top,kill,taskset`andsimilartoolstomanagevirtualmachines.4QEMU/KVMThreads5QEMU/KVMThreads●Onethreadper-VCPU●executeguestcodeVCPU0VCPU1●OneI/OthreadThreadThreadI/O●runsaselect(2)loopThrea

4、dtohandleevents.VCPU2VCPU...ThreadThread●Oneemulatorthread●mainthread●createandmanageProcessEmulatorThreadotherworkerthreads6LibvirtSupport-EmulatorThreadPinning●emulatorpindomain[cpulist][[--live][--config]

5、[--current]]●Queryorchangethepinningofdomain’semulatorthreadstohostphysi

6、calCPUs.●●2●emulatorpinisnotallowedifattributeplacementofelementvcpuis"auto".●Ifthisisomitted,andattributecpuseto

7、felementvcpuisnotspecified,emulatorthreadispinnedtoallthephysicalCPUsbydefault.7LibvirtSupport-EmulatorThreadPinning8Host/GuestCPUcappingisolation●Featuredescription●Allowtocappingguestvcpusindependentlyfromemulatorcpuusage.●RHEL6.2and6.3allowstocapguestcpuusage(process=vcpu+emul

8、ator)viavcpu_period/vcpu_quota●Whyisthefeatureneeded?●Performancetuning/forecast●EmulatorusesmuchcpusbecauseofI/O,migration,etc.guestvcpuscputimewillbereducedbecauseemulatorusemorecpu.●Candoinotherhypervisor(Xen,VMware...)9LibvirtSupport-EmulatorThreadPinning●schedinfo[--setparam

9、eter=value]domain[[--config][--live]

10、[--