Re: [libvirt-users] 'virsh capabilities' on Debian Wheezy-amd64 reports different cpu to Wheezy-i386 (on same hardware)

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(a)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