From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marcelo Tosatti <mtosatti@redhat.com>
Subject: Re: KVM guest OS reports zero CPU frequency via /proc/cpuinfo
Date: Fri, 1 Mar 2013 22:03:40 -0300
Message-ID: <20130302010340.GA28128@amt.cnet>
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Cc: kvm@vger.kernel.org, Don Slutz <Don@cloudswitch.com>
To: Dmitry Krivenok <krivenok.dmitry@gmail.com>
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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,
>=20
> I encountered an odd issue with running VMWare .vmdk image inside KVM=
=2E
>=20
> I run KVM as follows
> qemu-kvm -hda ./guest.vmdk -m 4096
>=20
> and guest OS (SLES11) boots fine, but reports zero CPU freq via
> /proc/cpuinfo (cpu MHz):
>=20
>=20
>=20
> $ cat /proc/cpuinfo
>=20
> processor       : 0
>=20
> vendor_id       : GenuineIntel
>=20
> cpu family      : 6
>=20
> model           : 2
>=20
> model name      : QEMU Virtual CPU version 0.15.1
>=20
> stepping        : 3
>=20
> cpu MHz         : 0.000
>=20
> cache size      : 4096 KB
>=20
> fpu             : yes
>=20
> fpu_exception   : yes
>=20
> cpuid level     : 4
>=20
> wp              : yes
>=20
> flags           : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mc=
a
> cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx lm up rep_good
> nopl pni cx16 popcnt lahf_lm
>=20
> bogomips        : 2088.96
>=20
> clflush size    : 64
>=20
> cache_alignment : 64
>=20
> address sizes   : 40 bits physical, 48 bits virtual
>=20
> power management:
>=20
> $
>=20
>=20
>=20
> I tried to convert .vmdk to qcow2 image and also tried different
> =E2=80=93cpu=3D<MODEL> options, but I always get zero frequency in th=
is guest.
>=20
> Another guest (Ubuntu in native qcow2 image) works fine and reports
> correct cpu frequency, so I only see this problem with this particula=
r
> .vmdk image.
>=20
>=20
>=20
> I=E2=80=99m running
>=20
> QEMU emulator version 0.15.1 (kvm-0.15.1-0.17.3), Copyright (c)
> 2003-2008 Fabrice Bellard
>=20
> on SLES11-SP2 host (3.0 kernel + patches).
>=20
> This problem is critical for me because by guest runs a binary which
> relies on non-zero CPU freq in /proc/cpuinfo.
>=20
>=20
> Any ideas?
>=20
> Thanks!
>=20
> --
> 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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