wrmsr has no effect

[mahmoodn]

wrmsr has no effect as I see

# modprobe msr
# rdmsr -p0 0x1a4
0
# wrmsr -p0 0x1a4 1
# rdmsr -p0 0x1a4
0
#

CPU is reported as

# lscpu
Architecture:        x86_64
CPU op-mode(s):      32-bit, 64-bit
Byte Order:          Little Endian
CPU(s):              2
On-line CPU(s) list: 0,1
Thread(s) per core:  1
Core(s) per socket:  1
Socket(s):           2
NUMA node(s):        1
Vendor ID:           GenuineIntel
CPU family:          6
Model:               79
Model name:          Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
Stepping:            1
CPU MHz:             2097.571
BogoMIPS:            4195.14
Hypervisor vendor:   VMware
Virtualization type: full
L1d cache:           32K
L1i cache:           32K
L2 cache:            256K
L3 cache:            20480K
NUMA node0 CPU(s):   0,1
Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc cpuid aperfmperf pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx hypervisor lahf_lm 3dnowprefetch epb pti dtherm ida arat pln pts

Any thought?

[andreas-abel]

You are using a virtual machine that probably doesn't support modifying this register. See also https://stackoverflow.com/questions/34181479/wrsmr-command-doesnt-register-my-input-in-msrs