This can happen on VMWare Workstation or ESXi. In the next section, we’ll look at some of the important flags that can help us understand what our CPU can do. In some cases the VT-x setting is not written to the configuration file of the VIRL VM. Vmx flags : vnmi preemption_timer invvpid ept_x_only ept_ad ept_1gb flexpriority tsc_offset vtpr mtf vapic ept vpid unrestricted_guest ple pmlīugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit srbdsĪddress sizes : 39 bits physical, 48 bits virtualĪs we can see, it prints our CPU’s specification containing the flags field. Model name : Intel(R) Celeron(R) CPU G3900 2.80GHzįlags : 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 pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust erms invpcid rdseed smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm arat pln pts hwp hwp_notify hwp_act_window hwp_epp md_clear flush_l1d We’ll use the cat command to read the file: # cat /proc/cpuinfo processor : 0 The /proc /cpuinfo virtual file contains information about the CPUs currently available in our system’s motherboard. The command will list many files, but we’re only interested in the cpuinfo file, which happens to be inside the base directory. r-r-r- 1 root root 0 Jul 13 00:18 zoneinfo r-r-r- 1 root root 0 Jul 13 00:18 vmstat r-r-r- 1 root root 0 Jul 13 00:18 filesystemsĭr-xr-xr-x 5 root root 0 Jul 13 00:18 fs/ r-r-r- 1 root root 0 Jul 13 00:18 diskstats r-r-r- 1 root root 0 Jul 13 00:14 devices r-r-r- 1 root root 0 Jul 13 00:14 cpuinfo r-r-r- 1 root root 0 Jul 13 00:18 consoles
Note: VSI nodes are to vmkernel what proc nodes are. Outside of that, host CPU information is visible in the vSphere client. In Windows, this is available in the System Control Panel. If Linux, dmidecode and cat /proc/cpuinfo will display some of the host CPU specification. auto at auto-virtual-machine: cat /proc/cpuinfo > processor. Other than non-interactive modes get and set commands, this tool offers abbreviated command options only. CPU information is also available within the guest operating system. Let’s see what’s inside the /proc directory: # ls -halF /proc total 4.0K I am still trying to map the KVM config with ESXi but no luck > yet. We might need root access to read some of the virtual files. On most Linux distributions, virtual files are located in the /proc directory. Unlike a regular file, virtual files don’t take space on the disk and are only created when we read them. So, they’re kind of lenses through which we can peek at the running Linux kernel. By reading virtual files, we can see what the Linux kernel is doing at the moment. Model name : Intel(R) Xeon(R) CPU E5645 2.A virtual file is a special type of file available on Linux-based operating systems. Model name : Intel(R) Xeon(R) CPU E5645 2.40GHzįlags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc aperfmperf pni pclmulqdq ssse3 cx16 sse4_1 sse4_2 popcnt aes hypervisor lahf_lm ida arat epb dthermĪddress sizes : 40 bits physical, 48 bits virtual Plus, some other information is obviously missing, like cache alignment, address spaces etc. So they just copy the clock rate and use that number. Model name : Intel(R) Core(TM) i7 CPU 950 3.07GHzįlags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 b19 b21 mmx fxsr xmm sse2 b27Īs you can see, the bogomips is just trash, as they're not computed on bootup. Model name : Intel(R) Xeon(R) CPU X5660 2.80GHzįlags : 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 syscall nx rdtscp lm constant_tsc pni cx16 popcnt lahf_lmĪddress sizes : 36 bits physical, 48 bits virtual
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