Am 29.06.2013 23:12, schrieb Bill Davidsen: > And right again. Unfortunately I didn't say or mean vSphere, but rather KVM, the facility used by qemu-kvm to run > virtual machines. > > Hardware CPU: > vendor_id : GenuineIntel > model name : Intel(R) Core(TM) i5-2400 CPU @ 3.10GHz > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx > fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology > nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid > sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx lahf_lm ida arat epb xsaveopt pln pts dtherm > tpr_shadow vnmi flexpriority ept vpid > > On 2.6.32-358.11.1.el6.i68 VM: > vendor_id : GenuineIntel > model name : QEMU Virtual CPU version 1.0.1 > flags : fpu de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pse36 clflush mmx fxsr sse sse2 syscall > nx lm unfair_spinlock pni cx16 popcnt hypervisor lahf_lm > > But on 3.9.6-200.fc18.x86_64 VM: > vendor_id : GenuineIntel > model name : QEMU Virtual CPU version 1.0.1 > flags : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pse36 clflush mmx fxsr sse sse2 > syscall nx lm rep_good nopl pni cx16 popcnt hypervisor lahf_lm > > Other than the flag name change, neither VM has aes set, I assume the flag is blocked for security, although I > don't see bugs about it. > > Anyway, switching all our servers to something else at this time is not even a worth discussion, so my note was > just a warning for people using the KVM tools included in Fedora looks like KVM is still far behind VMware "model name: QEMU Virtual CPU version 1.0.1" what the hell - on VMware you have the same CPU as the host and only "VMware EVC" is filtering CPU capabilities to provide relieable hot-migration between hosts by make only the flags of the oldest CPU in the cluster visible to guests that's why a VMwar eguest has around 905-98 % of the native performance because there is only few binary translation and most instrcutions are passed 1:1
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