Re: [Xen-devel] Runaway real/sys time in newer paravirt domUs?

[Jed Smith <jed@xxxxxxxxxx>]

On Jul 9, 2010, at 12:00 PM, Jan Beulich wrote:

>>>> On 09.07.10 at 16:57, Jed Smith <jed@xxxxxxxxxx> wrote:
>> On Jul 9, 2010, at 4:46 AM, Jan Beulich wrote:
>>> Is this perhaps also dependent on the CPU make/model?
>> - Between 2.6.29 and 2.6.30, /proc/uptime behaves much differently, and the 
>> bug
>>   then exposes itself.  Something changed there.
> 
> Others as well as me had seen similar misbehavior (outside of pv-ops),
> but only on reasonably new Intel systems. sched_clock_stable getting
> set to one in arch/x86/kernel/cpu/intel.c turned out to be the problem.

Is there a way to test this that I could perform for you?  We're getting
more reports of the same issue in our newer kernels.  Do you think
CONFIG_NO_HZ makes a difference either way?

Regards,

Jed Smith
Systems Administrator
Linode, LLC
+1 (609) 593-7103 x1209
jed@xxxxxxxxxx


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