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Sunday, January 5, 2014

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:

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