[libvirt-users] 'virsh capabilities' on Debian Wheezy-amd64 reports different cpu to Wheezy-i386 (on same hardware)
Struan Bartlett
struan.bartlett at NewsNow.co.uk
Mon Mar 3 11:15:51 UTC 2014
On 03/03/2014 10:55, Martin Kletzander wrote:
> On Mon, Mar 03, 2014 at 10:47:03AM +0000, Struan Bartlett wrote:
>> On 03/03/2014 10:44, Martin Kletzander wrote:
>>> On Mon, Mar 03, 2014 at 10:30:11AM +0000, Struan Bartlett wrote:
>>>> Hi Martin
>>>>
>>>> Thanks for your response. Here's the output of that grep:
>>>>
>>>> # grep ^flags /proc/cpuinfo | sort -u
>>>> 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
>>>>
>>>> I've just managed to install the libvirt-bin:amd64 package on the same
>>>> machine, on the wheezy-i386 distribution. The output of 'virsh
>>>> capabilities' is now reported correctly, and my VMs that required
>>>> SandyBridge are now booting.
>>>>
>>>> Have you any further suggestions?
>>>>
>>> Oh, I missed the fact that it was 32 bit distro. In that case, I
>>> guess some cpu features won't be available. No other ideas.
>> Ok thanks Martin. If the amd64 and i386 versions of the package are
>> behaving differently in this respect, on otherwise the same hardware,
>> kernel and distro, then I can only presume this is a bug, so my next
>> step would be to raise this on the development list.
> Just a guess, but our CPUID instruction might be translated to
> assembly code differently. You can try running 'cpuid -ir' (or 'cpuid
> -ir1' if it's the same on all cpus) on both machines, that will give
> you the results libvirt is processing. If that output is different
> than there is nothing libvirt can do. If it's the same, it might be a
> libvirt bug.
You might be onto something here. The following are run on the same
physical machine:
# apt-get install cpuid:i386
# cpuid -ir1 >/tmp/cpuid-ir1-i386
# apt-get install cpuid:amd64
# cpuid -ir1 >/tmp/cpuid-ir1-amd64
# diff -ubw /tmp/cpuid-ir1-i386 /tmp/cpuid-ir1-amd64
--- /tmp/cpuid-ir1-i386 2014-03-03 11:13:00.839208222 +0000
+++ /tmp/cpuid-ir1-amd64 2014-03-03 11:13:13.283307377 +0000
@@ -10,11 +10,11 @@
00000008 00000000 00000000 00000000 00000000
00000009 00000000 00000000 00000000 00000000
0000000a 07300403 00000000 00000000 00000603
-0000000b 00000000 00000000 000000e8 0000002c
+0000000b 00000000 00000000 0000006f 0000002c
0000000c 00000000 00000000 00000000 00000000
0000000d 00000000 00000000 00000000 00000000
80000000 80000008 00000000 00000000 00000000
-80000001 00000000 00000000 00000001 2c100000
+80000001 00000000 00000000 00000001 2c100800
80000002 20202020 6e492020 286c6574 58202952
80000003 286e6f65 43202952 45205550 36322d35
80000004 204c3035 20402030 30382e31 007a4847
Could this be enough difference to throw cpu-detection off?
Struan
>>> Martin
>>>
>>>> Struan
>>>>
>>>> On 03/03/2014 10:00, Martin Kletzander wrote:
>>>>> 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
>>>>>>
>>>>>> --
>>>>>>
>>>>>> Struan Bartlett
>>>>>> NewsNow Publishing Limited
>>>>>>
>>>>>> Tel: +44 (0)845 838 8890
>>>>>> Fax: +44 (0)845 838 8898
>>>>>>
>>>>>> The UK's #1 News Portal:
>>>>>> > www.NewsNow.co.uk <http://www.NewsNow.co.uk> (est. 1998)
>>>>>>
>>>>>> Also tailored for Mobile:
>>>>>> > mobile.NewsNow.co.uk <http://mobile.NewsNow.co.uk/>
>>>>>>
>>>>>> Now with FREE Personalisation:
>>>>>> > Register <http://www.NewsNow.co.uk/register/>
>>>>>>
>>>>>> Bespoke B2B Internet News Monitoring:
>>>>>> > Internet News Monitoring
>>>>>> <http://www.newsnow.co.uk/services/newsmonitoring/>
>>>>>>
>>>>>> Bespoke B2B Headlines for Websites:
>>>>>> > Editorial-In-A-Box <http://www.newsnow.co.uk/services/websites/>
>>>>>>
>>>>>> NewsNow Publishing Limited, trading also as NewsNow.co.uk, is a company
>>>>>> registered in England and Wales under company no. 3435857 with
>>>>>> registered office The Euston Office, 1 Euston Square, 40 Melton Street,
>>>>>> London NW1 2FD
>>>>>>
>>>>>> _______________________________________________
>>>>>> libvirt-users mailing list
>>>>>> libvirt-users at redhat.com
>>>>>> https://www.redhat.com/mailman/listinfo/libvirt-users
>>>> --
>>>>
>>>> Struan Bartlett
>>>> NewsNow Publishing Limited
>>>>
>>>> Tel: +44 (0)845 838 8890
>>>> Fax: +44 (0)845 838 8898
>>>>
>>>> The UK's #1 News Portal:
>>>> > www.NewsNow.co.uk <http://www.NewsNow.co.uk> (est. 1998)
>>>>
>>>> Also tailored for Mobile:
>>>> > mobile.NewsNow.co.uk <http://mobile.NewsNow.co.uk/>
>>>>
>>>> Now with FREE Personalisation:
>>>> > Register <http://www.NewsNow.co.uk/register/>
>>>>
>>>> Bespoke B2B Internet News Monitoring:
>>>> > Internet News Monitoring
>>>> <http://www.newsnow.co.uk/services/newsmonitoring/>
>>>>
>>>> Bespoke B2B Headlines for Websites:
>>>> > Editorial-In-A-Box <http://www.newsnow.co.uk/services/websites/>
>>>>
>>>> NewsNow Publishing Limited, trading also as NewsNow.co.uk, is a company
>>>> registered in England and Wales under company no. 3435857 with
>>>> registered office The Euston Office, 1 Euston Square, 40 Melton Street,
>>>> London NW1 2FD
>>>>
>> --
>>
>> Struan Bartlett
>> NewsNow Publishing Limited
>>
>> Tel: +44 (0)845 838 8890
>> Fax: +44 (0)845 838 8898
>>
>> The UK's #1 News Portal:
>> > www.NewsNow.co.uk <http://www.NewsNow.co.uk> (est. 1998)
>>
>> Also tailored for Mobile:
>> > mobile.NewsNow.co.uk <http://mobile.NewsNow.co.uk/>
>>
>> Now with FREE Personalisation:
>> > Register <http://www.NewsNow.co.uk/register/>
>>
>> Bespoke B2B Internet News Monitoring:
>> > Internet News Monitoring
>> <http://www.newsnow.co.uk/services/newsmonitoring/>
>>
>> Bespoke B2B Headlines for Websites:
>> > Editorial-In-A-Box <http://www.newsnow.co.uk/services/websites/>
>>
>> NewsNow Publishing Limited, trading also as NewsNow.co.uk, is a company
>> registered in England and Wales under company no. 3435857 with
>> registered office The Euston Office, 1 Euston Square, 40 Melton Street,
>> London NW1 2FD
>>
--
Struan Bartlett
NewsNow Publishing Limited
Tel: +44 (0)845 838 8890
Fax: +44 (0)845 838 8898
The UK's #1 News Portal:
> www.NewsNow.co.uk <http://www.NewsNow.co.uk> (est. 1998)
Also tailored for Mobile:
> mobile.NewsNow.co.uk <http://mobile.NewsNow.co.uk/>
Now with FREE Personalisation:
> Register <http://www.NewsNow.co.uk/register/>
Bespoke B2B Internet News Monitoring:
> Internet News Monitoring
<http://www.newsnow.co.uk/services/newsmonitoring/>
Bespoke B2B Headlines for Websites:
> Editorial-In-A-Box <http://www.newsnow.co.uk/services/websites/>
NewsNow Publishing Limited, trading also as NewsNow.co.uk, is a company
registered in England and Wales under company no. 3435857 with
registered office The Euston Office, 1 Euston Square, 40 Melton Street,
London NW1 2FD
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/libvirt-users/attachments/20140303/c1888572/attachment.htm>
More information about the libvirt-users
mailing list