Which version of qemu are you using? Which version of the kernel are you running?
-- Vincenzo Romano - NotOrAnd.IT Information Technologies -- NON QVIETIS MARIBVS NAVTA PERITVS 2017-02-06 12:19 GMT+01:00 akhilesh rawat <akhileshrawat...@gmail.com>: > [root@centos qemu]# /usr/libexec/qemu-kvm -cpu help > x86 qemu64 QEMU Virtual CPU version 1.5.3 > x86 phenom AMD Phenom(tm) 9550 Quad-Core Processor > x86 core2duo Intel(R) Core(TM)2 Duo CPU T7700 @ 2.40GHz > x86 kvm64 Common KVM processor > x86 qemu32 QEMU Virtual CPU version 1.5.3 > x86 kvm32 Common 32-bit KVM processor > x86 coreduo Genuine Intel(R) CPU T2600 @ 2.16GHz > x86 486 > x86 pentium > x86 pentium2 > x86 pentium3 > x86 athlon QEMU Virtual CPU version 1.5.3 > x86 n270 Intel(R) Atom(TM) CPU N270 @ 1.60GHz > x86 cpu64-rhel6 QEMU Virtual CPU version (cpu64-rhel6) > x86 Conroe Intel Celeron_4x0 (Conroe/Merom Class Core 2) > x86 Penryn Intel Core 2 Duo P9xxx (Penryn Class Core 2) > x86 Nehalem Intel Core i7 9xx (Nehalem Class Core i7) > x86 Westmere Westmere E56xx/L56xx/X56xx (Nehalem-C) > x86 SandyBridge Intel Xeon E312xx (Sandy Bridge) > x86 Haswell Intel Core Processor (Haswell) > x86 Broadwell Intel Core Processor (Broadwell) > x86 Skylake-Client Intel Core Processor (Skylake) > x86 Opteron_G1 AMD Opteron 240 (Gen 1 Class Opteron) > x86 Opteron_G2 AMD Opteron 22xx (Gen 2 Class Opteron) > x86 Opteron_G3 AMD Opteron 23xx (Gen 3 Class Opteron) > x86 Opteron_G4 AMD Opteron 62xx class CPU > x86 Opteron_G5 AMD Opteron 63xx class CPU > x86 host KVM processor with all supported host features (only > available in KVM mode) > > Recognized CPUID flags: > pbe ia64 tm ht ss sse2 sse fxsr mmx acpi ds clflush pn pse36 pat cmov mca > pge mtrr sep apic cx8 mce pae msr tsc pse de vme fpu > hypervisor rdrand f16c avx osxsave xsave aes tsc-deadline popcnt movbe > x2apic sse4.2|sse4_2 sse4.1|sse4_1 dca pcid pdcm xtpr cx16 fma cid ssse3 tm2 > est smx vmx ds_cpl monitor dtes64 pclmulqdq|pclmuldq pni|sse3 > avx512vl avx512bw avx512cd avx512er avx512pf avx512ifma smap adx rdseed > avx512dq avx512f mpx rtm invpcid erms bmi2 smep avx2 hle bmi1 fsgsbase > avx512vbmi > 3dnow 3dnowext lm|i64 rdtscp pdpe1gb fxsr_opt|ffxsr mmxext nx|xd syscall > perfctr_nb perfctr_core topoext tbm nodeid_msr tce fma4 lwp wdt skinit xop > ibs osvw 3dnowprefetch misalignsse sse4a abm cr8legacy extapic svm > cmp_legacy lahf_lm > pmm-en pmm phe-en phe ace2-en ace2 xcrypt-en xcrypt xstore-en xstore > kvm_pv_unhalt kvm_pv_eoi kvm_steal_time kvm_asyncpf kvmclock kvm_mmu > kvm_nopiodelay kvmclock > pfthreshold pause_filter decodeassists flushbyasid vmcb_clean tsc_scale > nrip_save svm_lock lbrv npt > xgetbv1 xsavec xsaveopt > > > On Mon, Feb 6, 2017 at 4:45 PM, akhilesh rawat <akhileshrawat...@gmail.com> > wrote: >> >> thanks , but if you see the guest which was run as >> >> qemu -cpu host >> >> >> has auto generated model as SandyBridge in KVM process. >> >> usr/libexec/qemu-kvm -name compute-0 -S -machine >> pc-i440fx-rhel7.0.0,accel=kvm,usb=off -cpu >> SandyBridge,+vme,+ds,+acpi,+ss,+ht,+tm,+pbe,+dtes64,+monitor,+ds_cpl,+vmx,+smx,+est,+tm2,+xtpr,+pdcm,+pcid,+dca,+osxsave,+arat,+xsaveopt,+pdpe1gb >> -m 61440 >> >> So now running "--cpu SandyBridge" will make any difference >> >> >> >> >> On Mon, Feb 6, 2017 at 4:28 PM, Vincenzo Romano >> <vincenzo.rom...@notorand.it> wrote: >>> >>> 2017-02-06 11:36 GMT+01:00 akhilesh rawat <akhileshrawat...@gmail.com>: >>> > >>> > processor : 19 >>> > vendor_id : GenuineIntel >>> > cpu family : 6 >>> > model : 42 >>> >>> Hmmm. your guest CPU is a different model form the host one. >>> >>> Would you please: >>> >>> - try forcing "SandyBridge" cpu (that'd be your Intel Xeon E312xx) >>> instead of host and >>> - check the "Recognized CPUID flags" from the output of >>> "qemu-system-x86_64 -cpu help" ? >>> >>> -- >>> Vincenzo Romano - NotOrAnd.IT >>> Information Technologies >>> -- >>> NON QVIETIS MARIBVS NAVTA PERITVS >> >> >