Re: [Xen-devel] [Xen-users] Re: Xen 4 TSC problems

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.10.12 at 16:07, Mauro <mrsanna1@xxxxxxxxx> wrote:
> On 23 October 2012 13:50, Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx> wrote:
>> On Tue, Oct 23, 2012 at 09:50:13AM +0100, Jan Beulich wrote:
>>> >>> On 23.10.12 at 10:40, Mauro <mrsanna1@xxxxxxxxx> wrote:
>>> > On 23 October 2012 09:58, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>> >>>>> On 23.10.12 at 09:18, Mauro <mrsanna1@xxxxxxxxx> wrote:
>>> >>>>  A kernel run with no Xen underneath it.
>>> >>>
>>> >>> Here is:
>>> >>>
>>> >>> uname -a
>>> >>> Linux xen-p02 2.6.32-5-amd64 #1 SMP Sun Sep 23 10:07:46 UTC 2012
>>> >>> x86_64 GNU/Linux
>>> >>
>>> >> I'm sorry to say that, but 2.6.32 is nowhere close to "recent" (as
>>> >> I had asked for).
>>> >
>>> > Sorry I'm using squeeze in production servers and I don't have a test
>>> > machine on which install wheezy.
>>>
>>> And can't/don't want to install a self-built kernel?
>>
>> You could also boot one of those Live Image kernels. Like an Fedora or
>> Ubuntu and just capture this. That way you don't over-write anything.
> 
> Ok, I'll try the live image.
> Today I had another clock jump so cpuidle=0 doesn't work.
> I'll stay using clocksource= pit and cpuidle =0 for a while to see if
> they together work.
> But...how to know what C states the kernel uses?

If "cpuidle=0" alone doesn't work, your problem is not C-state
related, and you don't need to look up how much of it the native
kernel uses.

Jan


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