On Fri, Feb 28, 2014 at 03:45:01PM +0000, Struan Bartlett wrote:

Hi

On a range of Dell servers containing Intel 64bit processors, 'virsh
capabilities' reports the cpu differently on Debian Wheezy-amd64 and
Wheezy-i386. The results given by the Wheezy-i386 version seem very
wrong (since n270 is an Atom processor). Apart from architecture, the
package versions of libvirt-bin are identical: 1.2.1-1~bpo70+1.
/usr/share/libvirt/cpu_map.xml files are identical. Is this a known
issue? Details for one server are:

# cat /proc/cpuinfo| head -n 26
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 45
model name      : Intel(R) Xeon(R) CPU E5-2650L 0 @ 1.80GHz
stepping        : 7
microcode       : 0x70d
cpu MHz         : 1800.054
cache size      : 20480 KB
physical id     : 0
siblings        : 16
core id         : 0
cpu cores       : 8
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
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 pdpe1gb 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 dca sse4_1
sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx lahf_lm ida arat
xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid
bogomips        : 3600.10
clflush size    : 64
cache_alignment : 64
address sizes   : 46 bits physical, 48 bits virtual
power management:

...
</proc/cpuinfo for processors 1..31 snipped here for brevity>

Check if all 32 CPUs have *exactly* the same flags, I remember an
issue when we reported a wrong cpu because the probing code was
scheduled on one of them which had one flag missing.  If package and
cpu_map.xml are the same, this is the only thing I can think of.
Simple 'grep ^flags /proc/cpuinfo | sort -u' should do.  If only one
line is printed out than I don't know where the problem might be...

Martin

# Running Wheezy-amd64 libvirt-bin1.2.1-1~bpo70+1
# virsh capabilities

     <cpu>
       <arch>x86_64</arch>
       <model>SandyBridge</model>
       <vendor>Intel</vendor>
       <topology sockets='2' cores='8' threads='2'/>
       <feature name='pdpe1gb'/>
       <feature name='osxsave'/>
       <feature name='dca'/>
       <feature name='pcid'/>
       <feature name='pdcm'/>
       <feature name='xtpr'/>
       <feature name='tm2'/>
       <feature name='est'/>
       <feature name='smx'/>
       <feature name='vmx'/>
       <feature name='ds_cpl'/>
       <feature name='monitor'/>
       <feature name='dtes64'/>
       <feature name='pbe'/>
       <feature name='tm'/>
       <feature name='ht'/>
       <feature name='ss'/>
       <feature name='acpi'/>
       <feature name='ds'/>
       <feature name='vme'/>
     </cpu>


# Running Wheezy-i386 libvirt-bin1.2.1-1~bpo70+1
# virsh capabilities

     <cpu>
       <arch>x86_64</arch>
       <model>n270</model>
       <vendor>Intel</vendor>
       <topology sockets='2' cores='8' threads='2'/>
       <feature name='lahf_lm'/>
       <feature name='lm'/>
       <feature name='rdtscp'/>
       <feature name='pdpe1gb'/>
       <feature name='avx'/>
       <feature name='osxsave'/>
       <feature name='xsave'/>
       <feature name='aes'/>
       <feature name='tsc-deadline'/>
       <feature name='popcnt'/>
       <feature name='x2apic'/>
       <feature name='sse4.2'/>
       <feature name='sse4.1'/>
       <feature name='dca'/>
       <feature name='pcid'/>
       <feature name='pdcm'/>
       <feature name='xtpr'/>
       <feature name='cx16'/>
       <feature name='tm2'/>
       <feature name='est'/>
       <feature name='smx'/>
       <feature name='vmx'/>
       <feature name='ds_cpl'/>
       <feature name='dtes64'/>
       <feature name='pclmuldq'/>
       <feature name='pbe'/>
       <feature name='tm'/>
       <feature name='ht'/>
       <feature name='ss'/>
       <feature name='acpi'/>
       <feature name='ds'/>
       <feature name='pse36'/>
     </cpu>

Kind regards

Struan Bartlett

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