Hypervisor hardware differences on Openstack Rackspace Cloud

You can spin up test cloud servers and extract CPU flags with the help of this little script using csplit.

 
cat /proc/cpuinfo | csplit -z  - '/processor/' '{*}'
diff xx0*
grep flags xx01 | cut -d ':' -f 2 | xargs -n1 echo | sort > flags.txt

By comparing the results we can definitely say that:

• Performance1 and performance2 cloud servers are running on the same hardware.
• New performance cloud servers are hosted on Intel CPU.
• The standard (next generation) series are being hosted on AMD CPU.

The CPU flags for comparison.

 
processor       : 1
vendor_id       : AuthenticAMD
cpu family      : 16
model           : 4
model name      : Quad-Core AMD Opteron(tm) Processor 2374 HE
stepping        : 2
microcode       : 0x1000086
cpu MHz         : 2200.096
cache size      : 512 KB
fpu             : yes
fpu_exception   : yes
cpuid level     : 5
wp              : yes
flags           : fpu de tsc msr pae cx8 cmov pat clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow rep_good nopl pni cx16 popcnt hypervisor lahf_lm cmp_legacy extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch hw_pstate
bogomips        : 4400.19
TLB size        : 1024 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 45
model name      : Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz
stepping        : 7
microcode       : 0x70d
cpu MHz         : 2600.068
cache size      : 20480 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 1
apicid          : 0
initial apicid  : 43
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu de tsc msr pae cx8 sep cmov pat clflush mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc rep_good nopl pni pclmulqdq ssse3 cx16 sse4_1 sse4_2 popcnt tsc_deadline_timer aes hypervisor lahf_lm arat pln pts dtherm
bogomips        : 5200.13
clflush size    : 64
cache_alignment : 64
address sizes   : 46 bits physical, 48 bits virtual
power management: