On 9 Dec 2020, at 09:09, jb <jonbae77@gmail.com> wrote:

Thanks Michal for the explanation. I will dive in this article and see if I understand it :-).

I use here the latest 4.4.3.12 Version. So I can hope, that newer version will support my CPUs better :).

not sure.

4.5 cluster level adds IceLake which is Gen10, that should work with CentOS 8.3 newly.

It could be that your particular model is something in between…

Either way, if you really do need every feature from the CPU and you’re willing to sacrifice migration compatibility you can always use CPU host passthrough. Then it ignores any compatibility and just uses everything it can(everything that KVM supports) from the underlying CPU

No I don't need every feature. My concern was mostly, if I will have any performance downsides in normal scenarios.

Am 08.12.20 um 19:12 schrieb Michal Skrivanek:

qemu CPUs are mostly mapping to microarchitectures, for this one there’s excessive number of details at [1] :)

but yours seems to be CofeeLake (8th gen) which is not really supported yet in that version. Well, you didn’t say anything about what your version is, so I don’t know for sure…

It’s usually a compromise between what the hardware has and what has been implemented just yet

Thanks,

michal

[1] https://en.wikichip.org/wiki/intel/microarchitectures/skylake_(server)

On 8 Dec 2020, at 17:09, jb <jonbae77@gmail.com> wrote:

I get this output:

"cpuFlags": "sse4_2,hle,mpx,pti,pge,pbe,rtm,popcnt,cpuid,md-clear,lm,invtsc,invpcid_single,ibrs,tsc_deadline_timer,movbe,avx2,ibpb,pse36,umip,hypervisor,erms,fpu,bts,monitor,cmov,arch-capabilities,nx,mca,abm,pschange-mc-no,aes,ht,xsaves,ds_cpl,nonstop_tsc,adx,epb,bmi2,hwp,hwp_act_window,dtherm,aperfmperf,vme,invpcid,art,nopl,fsgsbase,pts,sep,cx8,msr,acpi,x2apic,xgetbv1,fma,flush_l1d,vmx,sse2,pat,constant_tsc,ssbd,sdbg,rdrand,clflushopt,cx16,ept,tsc_adjust,intel_pt,pse,de,stibp,sse,vpid,hwp_epp,ida,xsavec,arat,pae,clflush,tm,rdtscp,lahf_lm,cpuid_fault,pclmulqdq,fxsr,flexpriority,mtrr,syscall,ssse3,pdcm,3dnowprefetch,sse4_1,smep,rep_good,est,tpr_shadow,smap,dts,skip-l1dfl-vmentry,tm2,vnmi,hwp_notify,tsc_known_freq,mmx,dtes64,xsave,arch_perfmon,avx,rdseed,smx,ss,xtpr,f16c,bmi1,pni,pdpe1gb,apic,mce,xtopology,xsaveopt,pebs,pcid,tsc,md_clear,amd-ssbd,pln,spec_ctrl,model_Conroe,model_kvm32,model_Penryn,model_Skylake-Client-noTSX-IBRS,model_IvyBridge-IBRS,model_Broadwell-noTSX-IBRS,model_Opteron_G2,model_n270,model_SandyBridge-IBRS,model_pentium,model_kvm64,model_Westmere,model_Haswell-noTSX-IBRS,model_Haswell,model_pentium2,model_pentium3,model_Westmere-IBRS,model_Opteron_G1,model_Skylake-Client-IBRS,model_Nehalem,model_coreduo,model_Skylake-Client,model_qemu64,model_Haswell-IBRS,model_Haswell-noTSX,model_Broadwell-IBRS,model_IvyBridge,model_core2duo,model_486,model_Nehalem-IBRS,model_Broadwell-noTSX,model_SandyBridge,model_Broadwell,model_qemu32",
    "cpuModel": "Intel(R) Xeon(R) E-2246G CPU @ 3.60GHz",
    "cpuSockets": "1",
    "cpuSpeed": "4499.377",
    "cpuThreads": "12",
    "deferred_preallocation": true,

Does this says something to you?

Am 08.12.20 um 17:02 schrieb Vinícius Ferrão:

AFAIK Client is for the i3/i5/i7/i9 families and the other one is for Xeon platforms.

But you have pretty unusually Xeon, so it may be missing some flags that will properly classify the CPU.

You can run this on the host to check what’s detected:

[root]# vdsm-client Host getCapabilities

Sent from my iPhone

On 8 Dec 2020, at 10:52, jb <jonbae77@gmail.com> wrote:

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