KVM guest OS reports zero CPU frequency via /proc/cpuinfo

KVM guest OS reports zero CPU frequency via /proc/cpuinfo

[Dmitry Krivenok]

Hello,

I encountered an odd issue with running VMWare .vmdk image inside KVM.

I run KVM as follows
qemu-kvm -hda ./guest.vmdk -m 4096

and guest OS (SLES11) boots fine, but reports zero CPU freq via
/proc/cpuinfo (cpu MHz):



$ cat /proc/cpuinfo

processor       : 0

vendor_id       : GenuineIntel

cpu family      : 6

model           : 2

model name      : QEMU Virtual CPU version 0.15.1

stepping        : 3

cpu MHz         : 0.000

cache size      : 4096 KB

fpu             : yes

fpu_exception   : yes

cpuid level     : 4

wp              : yes

flags           : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx lm up rep_good
nopl pni cx16 popcnt lahf_lm

bogomips        : 2088.96

clflush size    : 64

cache_alignment : 64

address sizes   : 40 bits physical, 48 bits virtual

power management:

$



I tried to convert .vmdk to qcow2 image and also tried different
–cpu=<MODEL> options, but I always get zero frequency in this guest.

Another guest (Ubuntu in native qcow2 image) works fine and reports
correct cpu frequency, so I only see this problem with this particular
.vmdk image.



I’m running

QEMU emulator version 0.15.1 (kvm-0.15.1-0.17.3), Copyright (c)
2003-2008 Fabrice Bellard

on SLES11-SP2 host (3.0 kernel + patches).

This problem is critical for me because by guest runs a binary which
relies on non-zero CPU freq in /proc/cpuinfo.


Any ideas?

Thanks!

--
Sincerely yours, Dmitry V. Krivenok
e-mail: krivenok.dmitry@gmail.com
skype: krivenok_dmitry
jabber: krivenok_dmitry@jabber.ru
icq: 242-526-443

Re: KVM guest OS reports zero CPU frequency via /proc/cpuinfo

[Marcelo Tosatti]

https://lists.gnu.org/archive/html/qemu-devel/2012-10/msg02269.html

On Wed, Feb 20, 2013 at 01:25:04AM +0400, Dmitry Krivenok wrote:
> Hello,
> 
> I encountered an odd issue with running VMWare .vmdk image inside KVM.
> 
> I run KVM as follows
> qemu-kvm -hda ./guest.vmdk -m 4096
> 
> and guest OS (SLES11) boots fine, but reports zero CPU freq via
> /proc/cpuinfo (cpu MHz):
> 
> 
> 
> $ cat /proc/cpuinfo
> 
> processor       : 0
> 
> vendor_id       : GenuineIntel
> 
> cpu family      : 6
> 
> model           : 2
> 
> model name      : QEMU Virtual CPU version 0.15.1
> 
> stepping        : 3
> 
> cpu MHz         : 0.000
> 
> cache size      : 4096 KB
> 
> fpu             : yes
> 
> fpu_exception   : yes
> 
> cpuid level     : 4
> 
> wp              : yes
> 
> flags           : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca
> cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx lm up rep_good
> nopl pni cx16 popcnt lahf_lm
> 
> bogomips        : 2088.96
> 
> clflush size    : 64
> 
> cache_alignment : 64
> 
> address sizes   : 40 bits physical, 48 bits virtual
> 
> power management:
> 
> $
> 
> 
> 
> I tried to convert .vmdk to qcow2 image and also tried different
> –cpu=<MODEL> options, but I always get zero frequency in this guest.
> 
> Another guest (Ubuntu in native qcow2 image) works fine and reports
> correct cpu frequency, so I only see this problem with this particular
> .vmdk image.
> 
> 
> 
> I’m running
> 
> QEMU emulator version 0.15.1 (kvm-0.15.1-0.17.3), Copyright (c)
> 2003-2008 Fabrice Bellard
> 
> on SLES11-SP2 host (3.0 kernel + patches).
> 
> This problem is critical for me because by guest runs a binary which
> relies on non-zero CPU freq in /proc/cpuinfo.
> 
> 
> Any ideas?
> 
> Thanks!
> 
> --
> Sincerely yours, Dmitry V. Krivenok
> e-mail: krivenok.dmitry@gmail.com
> skype: krivenok_dmitry
> jabber: krivenok_dmitry@jabber.ru
> icq: 242-526-443
> --
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