Re: Performance counters in kvm?

["Binh Q. Pham" <binhpham@cs.rutgers.edu>]

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.

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.

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