Libvirt-TSC-Deadline-Hongming

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1、TSC-deadlineHongminghongmingzhang@126.com2012.10.191TSC-Deadline●APIC(AdvancedProgrammableInterruptController)●OnelocalAPICtimerishardwiredtoeachCPUcore.●LocalAPICsmanageallexternalinterruptsforsomespecificprocessorinanSMPsystem●Acceptandgenerateinter-processorinterrupts(IPIs)betweenLAP

2、ICs●TSC-DeadlineMode●Softwaresetsa"deadline"●LocalAPICgeneratesatimerIRQwhenthevalueoftheCPU'stimestampcounterisgreaterthanorequaltothedeadline.●OnlySandyBridgeandnewerincludeit●RHEL6.4supportit2LibvirtSupportforTSC-Deadline●Bug804749-[Intel6.4FEAT]VIRT:TSCdeadlinesupportforlibvirt●Bug8

3、37884-per-machine-typeCPUmodelsforsafemigration●Noworkneedstobedoneonlibvirt●Don'timplementinterfacethatwouldallowlibvirttocheckexactlywhichfeaturesaregoingtobeexposedforeacheachmachine-type/CPU-modelcombination●TestOnly3LibvirtSupportforTSC-Deadline●Whenlibvirtisaskedtostartadomainwith

4、SandyBridgeCPUmodel,itfirstchecksifthehostiscompatiblewithSandyBridgeandthenstartsqemu-kvmwith-cpuSandyBridge./usr/share/libvirt/cpu_map.xml4LibvirtSupportforTSC-Deadline●Oncethehostisbelievedtobecompatiblewithlibvirt'sSandyBrdige(tsc-deadline).●libvirtstartsqemu-kvmwithcorrectarguments

5、generatedfromdomainXMLand-cpuSandyBridge.●Qemu-kvmtheneitherexposestsc-deadlinefeaturetotheguest(ifmachinetypeisrhel6.4.0)ornot(ifmachinetypeisolder).●AdomainwithSandyBridgecpuandrhel6.3.0machinetypewillneverseetsc-deadlinefeatureregardlessonhostOSorlibvirtversion.5Per-machine-typeCPUmo

6、delsforsafemigration-Mrhel6.4.0-cpuSandyBridge"tsc_deadline_timer"RHEL6.4RHEL6.3SandyBridgecpuSandyBridgecpu-Mrhel6.3.0-cpuSandyBridgeNo"tsc_deadline_timer"6Q&A7