Re: Performance counters in kvm?

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On Mon, Dec 09, 2013 at 01:59:41PM -0500, Binh Q. Pham wrote:
> Sorry for a late response as I was distracted by another task in the
> last few weeks. Today, I compiled and installed QEMU 1.7.0 from
> source, but no luck with this. Tested on a different machine with
> different kernel version: 3.2, I got the same results.
What do you mean by "different kernel version: 3.2"?

> 
> Btw, I found bug 798936 which describes similar problem here:
> bugzilla.redhat.com/show_bug.cgi?id=798936
> 
> it seems like this problem has been detected and resolved in the
> past. Do you know what Linux distro/kernel that the bug was resolved
> on? Maybe I can try that instead of using ubuntu to see if it works.
> 
The fix is present in QEMU 1.7.0.

> Thanks,
> Binh
> On 11/14/2013 04:08 PM, Gleb Natapov wrote:
> >On Thu, Nov 14, 2013 at 03:31:01PM -0500, Binh Q. Pham wrote:
> >>My host kernel version is 3.10.17
> >>
> >That one surely has PMU emulation, but your guest does not see it. I blame
> >QEMU. Can you compile QEMU from git?
> >
> >>Binh
> >>On 11/14/2013 12:21 PM, Gleb Natapov wrote:
> >>>On Thu, Nov 14, 2013 at 12:04:50PM -0500, Binh Q. Pham wrote:
> >>>>cpuid output is attached.
> >>>PMU support is not advertised to the guest which means that either
> >>>QEMU is broken or your host kernel does not have PMU kvm support. What is
> >>>your host kernel version?
> >>>
> >>>>I didn't know that the kernel was not compiled with virtualization
> >>>>support as I was using a ready image from ubuntu website to install
> >>>>the VM. In the long run, are you suggesting me to recompile the
> >>>>kernel for the guest to make sure that it has virtualization
> >>>>support?
> >>>>
> >>>I am surprised ubuntu kernel does not have virtualiztion support
> >>>compiled in. May be they have separate kernel for that, but I am not
> >>>ubuntu user so cannot tell.
> >>>
> >>>
> >>>--
> >>>			Gleb.
> >--
> >			Gleb.
> 
> 
> -- 
> -Binh
> 
> --
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--
			Gleb.
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